Inside the calipers are the brake pads. UNTIL he met a reclusive tribe of near mythical athletes at the bottom of a Mexican canyon, Micah True could never figure out why his running injuries got worse as his running shoes got better. People forget all the things she has to hear and she has heard. We actually strive to perfect, or at least satisfactorily master, one thing. This will help you to teach your students better. Terry has written for local sports publications in the Memphis, TN area. While I still worry about what I eat, and my weight (I only 5 and 40lbs on me is a lot more than it is on someone who is only 3 taller), I love not feeling guilty about eating. The final rule also highlights (without changing) the existing consequences if an employee does not provide proper notice of his or her need for FMLA leave.. And they can't move his body.

cheap wholesale lots

Hence, her satirical look at New Age culture.

cheap NBA jerseys

The UC regents, in a closed door meeting, approved the proposed settlement payment to 21 UC Davis students and alumni who sued the university and contended their civil rights were violated in the widely criticized pepper spray incident. Flip flops meet exercise machine in the trim treads. wholesale cheap jersey The solid foundation that we've built over the last several years are really going to enable us to maintain our progress against our long term targets, and importantly, allow us to continue to deliver shareholder value as we report another good year in 2014.. I was quite young at the time, but I remember thinking, "Well, a person who couldn't tie their laces just wouldn't wear shoes with laces, surely." These days I actually know a couple of people born without arms and hands, or who otherwise don't have the use of them, and guess what? They don't wear shoes with laces. Brian AtwoodThis American shoe designer and model who is from the Chicago suburbs, started out loving fashion at a very young age. Another player, Tristan Thompson he's a Canadian kid, went to high school in the United States, went to college for a year in Texas, and now he's making a name for himself on this big stage of the NBA playoffs. Circulation is important to us the CEO expects to be interrupted as he walks up the stairs. Right now, the Kerry talks are hardly ready for prime time, and until they're much farther along Obama should keep his distance.. I wonder if you think that might be part of it.. The Distance Racer is designed for use during races and triathlons, but is stable and cushioned enough for long distances, such as marathons.

We are committed to a high level of customer satisfaction and we look forward to hearing your concerns, comments or suggestions. Your questions, no matter big or small, are always welcome. Please do not hesitate to contact us in any way that you prefer. (Please do not send any returns to the address below. If you need to return a product, please contact us at Service@droking.com )

Working Hours:
Monday to Friday: 09:30 – 18:00 (Hong Kong Time: GMT + 8)

Email: 
Any questions, please feel free open a topic on FORUM or send email to: Service@droking.com, we will respond your emails within 24 hours during weekdays, 48 hours at weekends.

Facebook:
Be our friend on https://www.facebook.com/drokingcom and we’ll friend you back. We welcome you to place any concerns you might have on our Facebook page. Yes, Facebook is a public place where the whole Internet is listening. But we welcome such transparency in our customer relationships.

181 comments

  1. I have a 12v 500w single output power supply and a 12v 400w drill motor. Just purchased your small 0.56 tachometer on amazon… How do I wire it?

  2. I now have 5 of your products all are 5 stars, good products good service the best.

  3. Verl Rothlisberger

    Just purchased meter with v and amps. including shunt. Meter has tree wires and no directions on connections? Black, Yellow and red..???

    Verl K.

    • Hi, thanks for your business. could you please tell us your order number? So you want to get a wiring diagram right?

    • I also got the same one and also wasn’t any instructions. They need to include instructions for the shunt three wire DC volt amp gauges.

      • Hi Gary Edwards,
        Thank you for writing in and sorry for the inconvenience caused on you.
        Could you please tell us your order ID or the link of the product so that we can ensure which product you are referring to?
        With your help, we can find a solution more quickly.
        Best regards

  4. I have a 2×80 24V 2 channel amplifier in an enclosure. A 12V battery with 12/24 step-up with 24V on the output side. when adding inout volume from the source, the amp plays, but click/cuts in and out. I only have 2 leads to provide amp, +/-, but the amp has V*/GND/V-, so 3 wire inputs. Any help is appreciated.

    • … update… The amp is DROK TDA8920 and step is DROK 150W boost module, Input DC 10-32V,Output 10-46V((adjustable, default 19V)

    • Hi, the max output of the module is 150W, but the amplifier need a 160W stable power source. so when click/cunt in and out. The amplifier need dc dual power supply, the recommended voltage is ± 20V- ± 25V, the power is over 200W. So the DROK 150W boost module is not meet the requirement.

  5. Was trying to find any additional information on 110V controller I recently purchased from DROK, No wiring or instruction was received with the device. Your card with the device requested feedback. After trying to search your web site for additional information, you would not like my feedback. I would be more polite to say I won’t be doing business with you again. Regrets.

    • Dear buyer, thanks for you business and we are so sorry that we don’t have paper instructions for those DIY product but each product have descriptions on the website. Could you please tell us which product you purchased or what’s your order number? we will try our best to solve this problem. Thanks for your understanding and looking forward to your reply.
      Best regards,

  6. What is the input current required for DROK DC Buck Voltage Regulator Converter 17-35V 24V to 12V Regulated Power Supply Converter Module Waterproof 3A Car Volt Converters?

    I need this data for my project.

    • hi, there is no limit to the maximum input current, the minimum input current is as if it can supply the output driver. If you have any other questions, don’t hesitate to write back to us.

  7. Hi, i need the istruction in italian language…. is possible??

    • dear friend,
      thank you for your message.
      we are sorry we don’t have the instruction in Italian language.
      hope you can understand.
      have a nice day.
      best regards

      • Donald J. Mangold

        I purchased the following item from your Amazon store:

        DROK® Multifunction Mega328 NPN/PNP Transistor Checker Capacitor ESR SCR/MOSFET LCD Display

        The unit works but the screen is scratched and there is a dark spot on the screen in the upper right corner.

        • Hi, thanks for your business and sorry about the troubles. could you please send us photo, or maybe you can contact us for you order. please don’t worry, we will find a solution for you. Thanks!

  8. Donald J. Mangold

    I purchased the following item from your Amazon store:

    DROK® Multifunction Mega328 NPN/PNP Transistor Checker Capacitor ESR SCR/MOSFET LCD Display

    The unit works but the screen is scratched and there is a dark spot on the screen in the upper right corner.

    • Hi, thanks for your business and sorry about the troubles. could you please send us photo, or maybe you can contact us for you order. please don’t worry, we will find a solution for you. Thanks!

  9. Hello, I have a need for a 50W power amp for my product. I would like to have a quote for the manufacture to fulfill my product needs.What is the scheduling involved and requirements per order?

    • Hi, are you talking this TPA3123/NE5532 Digital Amplifier? if not, please send us the product link and tell us how many you want to buy. BTW, do you live in the US? we will reply the scheduling and unit price according to your order. Looking forward to your reply. Thanks!

  10. I purchased the following meter through amazon-DROK® 2 Wires DC 0-50A Digital Current Meter Blue LED Amp Meter+Amperage Shunt Resistance

    Please advise proper wiring for it.

    Thank you

    • Hi, sorry the the inconvenience caused. Below is the wiring instructions:
      090889_wiring
      Please wiring the meter and your device as the diagram. If you have any troubles about the wiring, please send us your wiring photos and tell us more details.
      Best regards,
      DROK Service Team

  11. Hello, I purchased a DC 24V to 12V step down regulator and was wondering what the light colors mean. Under normal operation they are blue, however they occasionally turn red.

    Thank you

    • Hi Martin, thanks for the purchasing. Sorry that which product do you ask? Could you please give us the product link or your order number. Looking forward to your reply. Regards!

      • DROK® DC 24V to 12V CC CV Step Down Volts Regulator Constant Current/Voltage 8A DC Adjustable Buck Converter 7-40V To 1.2-35V LED Driver Charger Module with Charging Indicator Solar Power Supply DIY. The manufacturer part number shown is 090009||F with model number 090009_NEW.

        Thank you

  12. There is no wiring diagram for the mini amp I bought. This stopped my project dead in the water. X000qkmumv

    • Hi, we are sorry that we don’t have paper instruction for those DIY product, and all the information are on the website. Could you please tell us which product do you want to know. Maybe you can give us the product link or your order number. Also, please provide more details about your using environment and working statues. If you can, we sincerely hope that could you please send us a picture to let us check what is the problem detail? Looking forward to your reply. Regards!

  13. I just bought a voltage regulator from Amazon: http://www.amazon.co.uk/DROK-Constant-Converter-Regulator-Interface/dp/B00T2L76FA/ref=sr_1_10?ie=UTF8&qid=1448472070&sr=8-10&keywords=drok+regulator.

    it’s a nice product, but it would be useful to have some information about how to use it- either with the product, or available on the web site.

    I found out how to set the voltage, but I don’t know how to set the current limit, and I don’t know what the three LED colours mean. At the moment, the green one is on most of the time and the blue one comes on occasionally.

    • Hi Mike, we are sorry that we don’t have paper instruction for those DIY product, and we have updated the website info but it cannot update the product page now. Please following the steps to set the current limit.
      1. Adjust constant-voltage potentiometer to make output voltage reach the voltage value which you want.
      2. Use 10A multimeter to measure short-circuit output current (directly connect two meters to output interface), at the samt time, adjust constant-voltage potentiometer to make output current reach preset over-current protection value.

      And the about LEDs, red light is on in constant current status and off in constant voltage status, blue light is on when charging and off when full-charging and Green light is on when full-charged.

      If you still have any other questions, please feel free to contact us.
      Best regards,
      DROK Service Team

  14. Hello,

    I just bought a:

    DROK®Accurate Arduino Ultrasonic Distance Meassuring Sensor Module Precise ULtrsound Wave Distance Measurement Detector DC 5V Operating Voltage and I would like to view the data values of the distance mesured. Do you guys have like an app or something I could pair with to see how much distance is measured?

    Thanks!

    • Dear friend,
      Thank you for your information and Merry Christmas to you.
      The distance measured range is 0~15 feet.
      We are sorry to let you know that we don’t have any items can pair with it.
      Hope this will help you.
      Have a great day.
      Best regards

  15. Hi… I bought one Micro Stereo amplifier (http://www.amazon.com/gp/product/B010LRBGGS?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s01). It’s really good. Although, I found that in the picture shown in amazon, it displays it has a “mute switch” and a “power switch”, I would love to know what goes into those so I can improve my amplifier.

    • Hi, Gonzalo
      “mute switch” means you can connect a switch to control it, once you press the switch, the sound will disappear at once.
      “power switch” means you can add a switch to control it. press the switch to choose connect or disconnect the power supply.
      Hope this will help you.
      Best regards

      • Thanks… Can you help me find or help me how to look for a switch that could be placed in the board? I was searching and didn’t find anything I could place there.

  16. Hi,

    I bought DROK® Digital -55-125℃ Celsius Thermometer Small 0.36″ Red LED Panel Display.
    I thought it is operating by battery but it came with two wires (red, black).
    Can you please send me a instruction to connect it to power?

    • Hi Erik,
      Glad to hear from you.
      We feel sorry that we didn’t design a wiring instruction for this easy to install item.
      There are just two wires, one red and the other is black.
      Just connect the red one to the positive of power and connect the black wire to the negative of power.
      If you have any other questions, please write back.
      Best regards

  17. Hey Drok Team,

    I’m using the DROK® Bluetooth Remote Control Self-timer Wireless Camera Shutter for iPhone.

    http://www.amazon.de/DROK-Bluetooth-Self-timer-Wireless-Smartphones-Schwarz/dp/B00RECQPR4

    Since I changed my phone from iPhone 5 to 6s the remote control is not working anymote. Blue light on but doesn’t activate the phone to take a picture. Do you have any tips?

    Thanks
    Kind Regards
    Monika

    • Hi Monika Mocha,
      Glad to received your inquiry.
      First,please turn off the bluetooth on iphone 5, as this remote control will automatically connect the bluetooth on iphone 5.
      If iphone 6S has received the bluetooth signal, please cut off and then research bluetooth once more. To make it work for another phone, you have to make sure the former connection record has been removed.
      If this can’t work, you can contact customer support from your order for refund or resend.
      We will give every our customer best care.
      Best regards

  18. Hi, I have a Digital Multimeter AC 80-260V 100A Voltmeter Ammeter Power Energy Monitor Panel Meter Electricity Meter LCD Blue Backlight Display with Transformer CT. Can you send me the wiring diagram for the AC side please?

    • hi Tony,
      could you please send email to service at droking dot com?
      so we can offer the wiring diagram to you.
      happy lunar new year,
      best regards

  19. I need wiring instructions for the Drok 0 to 100vdc 3.5to30v power white

    • Hello, Steve sandholm,
      Could you pleases tell us your order ID or the ASIN of the product so that we can ensure what product you are referring to? Thanks

  20. Purchased your DEOK doc 12v digital thermometer X000961E15

    I would like to know where the sensor probe is???
    It has a black wire 8″ long with plastic end – not sure what this is for? (As well as the obvious connecting black and red wires)

    I purchased another digital thermometer from you a couple of months ago with a sensor probe attached to a length of cable (it worked once!) which now doesn’t work! So I was expecting the same probe with this device

    Please advise

    • Hello Amanda,
      The black wire with plastic end is the waterproof temperature sensor probe of this module.
      The red wire is connected to the positive of power supply while the black wire is connected to the negative.
      Could you please send us an email (service at droking dot com) to tell us your order ID or the ASIN of the another digital thermometer you purchased before and more details of how you operate it, such as the supply voltage, the wiring?
      It is better that you can send us some photos of the installation together.
      With your help, we can consult to our technician and find out a solution more effectively.
      Best regards

  21. Hello, I purchased 2 DC step-down module boards. (DIY LM2596) I am unable to get current through either board. I checked ohms on both sides. The positive is a closed circuit. The negative is open. I have turned the adjustment screw and nothing changes. Any suggestions? If you can’t resolve this, can I get these boards replaced? Or my money returned?

    • Hello Randy Jackson,
      Thank you for purchasing.
      Could you please tell us the ASIN of the product and more details of how you operate the product, such as the wiring, the input voltage/current, the working environment?
      If you can, we sincerely hope that you can sent us some photos of the problem details.
      Waiting for your reply.
      Thanks

      • Input voltage is 13.64 and may get up 16vdc from a small solar panel in direct sunlight. There is a number R1C3 on the board. Not sure if that is the ASIN. I will try to attach a photo in a email to you.

        • Hello Randy Jackson,
          Thank you for writing in.
          The number on the board is not the ASIN of the product.
          If you do not know the ASIN of the product, could you please tell us your order ID so that we can make sure which product you purchased?
          Thanks

  22. Hello,

    I recently purchased a 7 Mode USB Monitor from you all through Amazon. I am suspect that it is working properly and the amp meter reads all over the place. When plugged into the wall it will be stable for a moment then fluctuates up and down erratically throughout a charge. I have seen others on You Tube that do not display this way therefore I question if this one is faulty. Before I go through the return process on Amazon I would like to reach out to you all. Any help would be appreciated!

    • Hello Peter,
      Thank you for purchasing.
      Could you please tell us your order ID or the ASIN of the product you purchased and more details about how you operate the product, such as the input voltage/current; the output voltage/current?
      It is better that you can send us some photos of the problem details.
      Waiting for your reply.
      Thanks

  23. I have recently purchased 2 different DC – DC Buck converters. I am using these to regulate voltage coming from a 12V 20AH battery to run a 12V LED light. The actual voltage coming off the battery is about 13.4V and the lights run too hot at this voltage. I have them running currently at about 11.8V

    Both buck converters seem to work well. one is the Drok 3.5-30V to .8-29V 10A Step-down Volt Adjustable Output Voltage Regulator the other is the Drok DC-DC Voltage Buck Converter Volt Regulator 5V-30V to 0.8-29V Step-down Transformer Power Module 5A Constant Adjustable LED Dual Display (sorry no item numbers available)

    Can you tell me if these are the items you would reccommend for the application or if you might suggest an alternative? preferences on the 2? I am also concerned that it appears that there are only about 6 of one and 10 of the other available on Amazon. i will need about 20 of the item selected. Hope you can help.

  24. Hallo,Drok! Ich habe mir über Amazon 6 Stück 100 Volt ,10 Amper DC Mini Digital Voltmeter Volt Amp Meter LED Dual Display schicken lassen. Nach wenigen Malen Ein- und Ausschalten an 12 Volt Akkus, bzw. 12-Volt-Ladegerät sind schon drei Stück tot, nichts leuchtet mehr!!! Ich bin von Beruf gelernter Elektriker, Fernmeldemechaniker, Elektro/Elektronik- Ingenieur und seit ca. 65 Jahren intensiver Bastler auf diesem Gebiet. Ich habe auch eine Kurzschlussdiode mit falscher Polung gegen Spannungsspitzen eingebaut!!!!!!!!! Ich habe mit Sicherheit keinen Fehler gemacht!!!! Wer liefert mir Ersatz, der nicht kaputt geht im normalen Betrieb??? Ich habe zum Beispiel ein solches Instrument in mein Segelboot eingebaut, – für “Große Fahrt”! Unmöglich, wenn da andauernd das Instrument nichts mehr anzeigt! Dort muss ich ständig den Ladestrom kontrollieren! Ich kann nur vermuten, dass da irgendwo ein Konstruktionsfehler vorliegt. Sie sollten das umgehend überprüfen, ehe noch mehr Reklamationen kommen.
    Ich bitte alsbald um Ihre Antwort und Stellungnahme. Mit freundlichen Grüßen, Raimund Bigalk.

    • Lieber Freund,
      Vielen Dank für das Schreiben in. Wir schätzen Ihr Geschäft und so entschuldigen uns für die Probleme auf Sie verursacht.
      Könnten Sie uns uns eine E-Mail an Service senden Sie bitte Ihre Auftragsnummer an droking dot com zu erzählen oder die ASIN des Produkts?
      Es ist besser, dass Sie uns mehr Details zu sagen, wie Sie die Produkte, wie zum Beispiel die Eingangsspannung / Strom, der Verkabelung, die Arbeitsumgebung zu betreiben.
      Wenn Sie können, wir hoffen, dass Sie uns ein paar Fotos schicken können uns die Problemdetails informieren.
      Bitte um Vergebung und warten auf Ihre Antwort.
      Freundliche Grüße

      Dear friend,
      Thank you for writing in. We appreciate your business and so sorry for any trouble caused on you.
      Could you please send us an email to service at droking dot com to tell us your order ID or the ASIN of the product?
      It is better that you can tell us more details of how you operate the products, such as the input voltage/current, the wiring, the working environment.
      If you can, we sincerely hope that you can send us some photos to let us know the problem details.
      Beg your forgiveness and waiting for your reply.
      Best regards

  25. Hello

    I bought 60 of http://www.amazon.com/DROK-Voltage-Universal-Adaptors-Display/dp/B00DWXI6SA. I open 10 of them and they are all 15V output , not 12V. The 5V is fine, but 15 will burn all the devices I am going to use.
    We really need 12V here on that output.

    • Hello Luis,
      Thank you for purchasing.
      Could you please tell us more details of how you operate the product, such as the input voltage/current, the wiring, the working environment.
      If you can, we sincerely hope that you can send us an email(service at droking dot com) to send some pictures to let us check the problem details.
      With your help, we can find a solution more quickly.
      Best regards

  26. hey
    i bought 5
    http://www.amazon.com/DROK-Regulator-Adjustable-Converter-Indicator/dp/B00HHQ0VP4

    they work perfectly, but just have a mini question, i noticed it after plugin 2 loads in parallel
    what does a red LED signal mean and blue LED signal mean.

    does the red mean not enough current and i shouldn’t be loading the buck converter that much, or can i adjust the current?

    • Hello stewart,
      The LED indicator is charging indicator.
      The red means the battery is charging.
      The blue means the battery is full charged.
      Hope this can help you.
      Best regards

  27. HELLO,
    AC 220V 3800W HIGH….ED CONTROLLER THERMOSTAT,
    NEED WIRING DIAGRAM, NEED INSTRUCTIONS PLEASE

    • Hello JAMES LEGGE,
      Thank you for writing in.
      Could you please tell us your order ID or the link of the product?
      With your help, we can find a solution more quickly.
      Waiting for your reply.
      Thanks

  28. Hello James legge,
    2 “DROK® AC 220V 3800W…” have shipped.

    Details
    Order #103-1251615-4137019

  29. it was through Amazon want to use it as a thermostat control for 220 v need wiring diagram

  30. this don’t help any this all you can get

  31. find anything else yet please

  32. anything else yet still waiting

    • Hello JAMES LEGGE,
      Thank you for writing in.
      Sorry for the inconvenience caused on you.
      There is a wiring diagram in the PDF file.
      This product is applied to AC circuit, therefore no need to distinguish the positive terminal or the negative terminal.
      You can series connect this product to the circuit.
      Hope this can help you.
      Best regards

  33. I’m keen to buy one of your USB multimeters but am having difficulty finding a supplier who will ship to Australia.

    Can you direct me to a suitable supplier?

    David

    Canberra, Australia

    • Dear friend,
      Thank you for your interest in our product.
      Could you please send us an email (service at droking dot com) to tell us the link of the product you are interested?
      Thanks

  34. looking for
    GERI DC DC CONVERTER BUCK STIP DOWN MOUDULE 8-50V 48V 36V 24V 12V TO 5V 3A DUAL USB OUTPUT
    PLEASE ADVISE YOUR PART NUMBER AND HOW I WOULD GO ABOUT ORDERING ON IT.

    • Hello kim riordan,
      Thank you for your message.
      GERI is not our brand.
      Here is the similar product of our DROK (ASIN: B00KKICAWS )
      DROK® DC DC 8-50V 12V/24V/36V to 5V 3A Buck Voltage Converter Type A Dual USB Adapter Connector with Ear Power Supply Module Waterproof

      Feature:
      Input Voltage: DC 8-50V
      Output voltage: DC 5V
      Output Current: 3A MAX, 2.5A long-term work
      Output Power: 15W MAX
      Output ripple peak: 100
      Conversion rate: 85%
      Epoxy Glue, waterproof, shock, moisture
      Reverse polarity protection, overcurrent and overtemperature protection, automatic recovery after troubleshooting
      Dimension: 46 * 32 * 18mm
      Low pressure: 2V
      Operating temperature: Industrial grade -25 °c – +65 °c (ambient temperature exceeds 40 °c, please reduce power, or enhance heat dissipation)
      Full load temperature rise: 40 °c

      Please Note:
      No identification resistor, can not be used for Apple devices or the mobile phones with identification

      Hope this can help you.
      Best regards

  35. MURIEL PERRINELLE

    hello

    pls advise where i can buy this product ??
    for shipment in France

    DROK® Micro Load Tester Board USB DC 0-3A 3-20V

    DROK® Micro Load Tester Board USB DC 0-3A 3-20V Adjustable Constant Current Electronic Load Equipment Module 12V Charging Current Capacity Monitor Aging Device Discharge Resistance with Fan

    price for 2 pces
    price for 100 pces

    RGDS
    MURIEL PERRINELLE
    SPEED ELEC SAS
    4 RUE DE LA CROIX VIGNERON
    95160 MONTMORENCY
    FRANCE
    TEL 33 1 34 12 38 80
    muriel@speedelec.fr

  36. Hi Drok,

    I have an application for a 12 volt DC Motor that I’d like to reverse via remote control. The supply voltage is also 12 volt. The 2 channel units you offer have the ampacity to do the job. One channel could operate for each direction. What is not clear to me is how to lock them out so that a simultaneous push of both buttons doesn’t short. What can you offer on that topic or otherwise suggest?

    • Hello Dick,
      Thank you for writing in.
      Could you please tell us your order ID or the link of the product?
      With your help, we can find a solution more quickly.
      Best regards

  37. I just purchased a DROK 2203 adjustable BUCK supply. Power input is specified at 22v to 15volt input. I did not not realize that my power supply is 24 volts and I need to step down to 4.5 volts. Can I still use it? Or do I need a different supply.

    If I need a different supply can I exchange it? I bought it from amazon.com..

    • Hello Leo Horowitz,
      Thank you for writing in.
      Could you please tell us your order ID or the link of the product So that we can ensure which product you are referring to?
      Thanks

  38. I recently purchased one of your inexpensive 7V to 60V pulse width modulators on Amazon. I want to use it to cycle a fuel injector in a cleaning solution. It will turn the fuel injector on and off when I turn the dial, but it will not cycle the injector on and off. I have tried using a simple 9 volt battery and also a 12 volt booster pack. It behaves the same way with either power source. Does this mean that the PWM is faulty or am I doing something wrong.

  39. I tried to purchase some of the weekly clearance 5pcs Warm White USB Night light
    Promo Code: E03B00U7 and the code does not work… Thoughts???

    • Hello Ron,
      Thank you for writing in.
      Have you added 5pcs of the night light to your cart?
      If not, please add 5pcs of the night light to your cart then try the promo code again.
      Hope this can help you.
      If you have any questions, please feel free to contact us.
      Best regards

      • I tried with another item and the promo code worked fine the one for the 5 pc did not The promotional code you entered cannot be applied to your purchase. was what I got….

        • Hello Ron,
          Thank you for your reply.
          Could you please send us an email(service at droking dot com) with some images of the Amazon Checkout page in purchasing?
          With your help, we can find a solution more quickly.
          Waiting for your reply.
          Best regards

  40. Hi,

    Just received 2 off LTC187 DC boost boards. One board does not have a black heatsink (missing completely – not in bag) fitted over the conversion coil. (both silver heatsinks are fitted). Will I have to derate this device?

    • Hi Mike Dryer,
      Thank you for writing in.
      Could you please tell us your order ID or the link of the product you received?
      It’s better that you can send us an email(service at droking dot com) with some images of the product to let us check the problem details.
      Waiting for your reply.
      Best regards

  41. HI Drok,
    I purchased a digital Voltmeter/Ammeter from Amazon (link attached), I connected the wires as instructed in the figure. For the input, I used a Drok Boost converter (link attached). The voltage on the boost (i.e., input to digital voltmeter) was set to 16V ( I checked with multimeter before connecting) and the current to minimum.
    Once I connected the input, a diode (D1) popped.
    I need this part for my device, I have already designed my enclosure based on it and I have had good experience with Drok. So I am going to order another from Amazon.
    My concern is to prevent this from happening again. Do you have any suggestion as what might have gone wrong.
    I noticed there are two calibration rotary knobs on the board which I do not believe could have been part of the problem.

    V/A meter
    https://www.amazon.ca/gp/product/B00GLKQOKI/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

    Boost Converter
    https://www.amazon.ca/gp/product/B00E8D7XYG/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

    Best regards,

    • Hi Pouya,
      Could you please send us an email(service at droking dot com ) with some pictures or video to let us check the problem details?
      With your help, we can find a solution more quickly.
      Best regards

  42. I am interested in purchasing Drok small amp and speakers. On Amazon there are two ways. One can buy parts separately or in a “bundle”.

    Please cut and paste into url address box:

    Separate speaker:

    http://www.amazon.com/gp/product/B00C4MT274/ref=pd_luc_rh_bxgy_01_01_t_img_lh?ie=UTF8&psc=1

    Bundled speaker

    http://www.amazon.com/DROK-Portable-Amplifier-Regulator-Speakers/dp/B010FB89ME?ie=UTF8&psc=1&redirect=true&ref_=ox_sc_act_title_3&smid=AFHAE9RJVUMB

    What is the difference between the separate speakers and the ones packaged in the bundle?

    Sincerely,
    Gary

  43. Thank you so much. Seems like the bundle is not only less expensive but better speakers.

    One more question.

    In the bundle there is a power adapter. But the board is a two position terminal strip 12v + and 12v – [I will call these the power terminals].

    There seems to be a little adapter on the end of the power supply. Does this somehow or other either clip or screw on to the power terminals?

    • Hi Gary Graham,
      Here is a picture instruction of the board in the bundle for you:
      110044
      Hope this can help you.
      Best regards

  44. dear sir
    good morning
    i need an AC voltmeter Ammeter for 220 v and 100 amps. Do you have any dealer in pakistan?
    If yes, please provide me his/her address and phone number.

    Zeeshan
    Lecturer
    Pakistan

    • Hi Zeeshan,
      Thank you for your interest in our product.
      Could you please send us an email(service at droking dot com) to tell us the ASIN or the link of the product you need?
      Waiting for your reply.
      Best regards

  45. I bought a DROK® Numerical Control Voltage Regulator DC 5-32V to 0-30V 5A Buck Converter, 24V 12V to 5V Step Down Power Converter Adjustable Digital Control Voltage Reducer with LED Ammeter Voltmeter Display. It was dead after 3 weeks. I only used like several time and now its not working. No display and very dimmed led and no voltage output. Is there an warranty?

    • Hi maximilian,
      Thank you for writing in.
      Did the product work when you got it?
      Could you please tell us more details of how you operate the product, such as the input voltage/current, the wiring, the load, the working environment?
      If you can, we sincerely hope that you can send us some images or video to let us check the problem details.
      You can send this information to us by email (service at droking dot com).
      Looking forward to hearing from you.
      Best regards

  46. Spencer Sutton

    I purchased the AC 0-199.9V meter. It has 4 wires, which wires are for powering the screen and which wires are for measuring the voltage?

  47. Dear DROK. we like your USB based digital display multi-meter products. do you have anything available with USB type-C connectors?

    • Hello john chen,
      Thank you for your interest in our product.
      Here is a recommendation of a load battery tester with USB type-C connectors:
      DROK® DC 3-21V Load Battery Tester, 35W 3A Portable USB Monitor, Intelligent Constant Current Electric Discharge Resistance Power Resistor Kit for Power Bank Capacity Testing Support QC2.0/3.0
      TECHNICAL PARAMETERS:
      Voltage Range: DC 3-21V (compatible with quick charging such as the Qualcomm QC2.0, 5V/9V/12V/20V, Qualcomm QC3.0, BC 1.2, MTK-PE and Apple 2.4A etc.)
      Current Range: 0-3A continuously adjustable (roughly adjust 0-3A by per 0.1A , precisely adjust by per 0.01A)
      Accumulative Capacitance Range: 0-99999mAH
      Accumulative Electric Energy Range: 0-999.99Wh
      Power Range: 0-35W( the continuous discharging power is less than 35W)
      Accumulative Time Counting: 0-1000h
      Voltage Testing Deviation: 0.01V
      Threshold of Smart Temperature Control: when the temperature﹥55℃(131℉), the fan would automatically work; when﹤45℃(113℉), the fan would automatically turn back off
      Detector of Smart Temperature Control: premium NTC thermistor
      Switching Regulator IC Frequency for Fan: 1.2MHZ
      Power Supply Indicator: blue light when powering on
      Fan Speed: 6000/min, 40×40×20mm
      Controlling Chip: constant current chip
      Radiator: 6063 aerospace aluminum radiator, 40×40×10mm
      Adjustment Potentiometer: durable metal potentiometer
      Discharging Power Tube: voltage-controlled low-impedance MOSFET (more stable constant current when is on high voltage, high temperature)
      Operating Temperature: ﹣10 ~﹢65℃ (14-149℉)
      Product Dimensions: 100mm×48mm×30mm
      Hope this can help you.
      Best regards

  48. I just purchased a couple of your ac-dc 24v converters. While the output is marked + and – there appears to be no marking on the ac input. Does phasing matter with input voltage?

    • Hello John Scharres,
      Thank you for writing in.
      Could you please tell us your order ID or the link of the product?
      With your help, we can find a solution more quickly.
      Best regards

      • The Amazon order number was 107-4100990-9620258 and was for AC to DC converter 85 – 265v 50/60HZ AC to DC 24v adapter/industrial module switching power supply board.

        • Hi John Scharres,
          Thank you for your reply.
          AC input no need to distinguish + and -.
          Here is an image that we think it is useful to you:
          090233
          Hope this can help you.
          Best regards

  49. I would like to verify two part numbers. B00RUUSKS2 AND B01GFVHZUK. Is this in fact your manufacture part number? If these are not your part numbers, can you please provide the part numbers.

    Thank you

    • Hi, B00RUUSKS2 and B01GFVHZUK are Amazon ASINs. The part number of B00RUUSKS2 is 090233, and the other one is 200151. Is there any else we can help with?

  50. Paolo Callegaro

    Hello,

    I write from Italy!
    We need to buy urgently 60 pieces of the follwing step-up
    DROK® DC-DC 12V/24V Step-up Boost Converter Adjustable Output Voltage Stabilizer

    Where you can buy it urgently?

    Thank you
    Regards

    Paolo Callegaro

    • Hello Paolo Callegaro,
      Thank you for writing in.
      You can purchase the products from us directly.
      Since many products are with similar titles, it is hard for us to ensure which product you are referring to.
      Could you please send us an email (service at droking dot com) to tell us the link of the product?
      Waiting for your reply.
      Best regards

  51. I purchased the 090030 from Amazon. I was expecting that some kind of a spec sheet to accompany the order. It did not. I don’t really like to search the forums to get information on the device. Please provide a user manual.

  52. Drop,
    I want to purchase one of your digital ammeters/voltmeters to fit my Club Car golf carts. Mine is a 1999 model 48 volt. I have no idea as to which one to purchase or what else I need to make it work. What/which one do you suggest I use and what else do I need to make it work?
    Thank you for your reply,
    Jerry Simmons
    Fsimmons1946@gmail.com

    • Hello Jerry Simmons,
      Thank you for your interest in our product.
      Could you please tell us more details of your application, such as the input voltage/current, the measuring current/voltage range, the measured device, the working environment?
      With your help, we can recommend a more suitable product for your application.
      Looking forward to hearing from you.
      Best regards

  53. What is the unit of measurement on this device for each item?

    What would capacitance of 27.466 be?

    • Hello Adam,
      Thank you for writing in.
      Could you please tell us the ASIN or the send us the link of the product you are referring to?
      With your help, we can find a solution more quickly.
      Best regards

  54. Dear DROK,
    I have written yesterday here an inquiry, since the product I bought from you clearly didn’t work. I expected a feedback. Instead I can see my inquiry vanished from here.
    Is that how you usually treat your customers?
    Still hoping you will contact me over my email and we can clear this unpleasant case.

    Sincerely,
    Angel

    • Hello Angel,
      Thank you for writing in.
      So sorry that we cannot find out your message.
      Could you please tell us your problem details again?
      We will try our best to find a solution to you.
      Beg your forgiveness and understanding.
      Best regards

      • Hell Drok support,
        Nice to hear from you.
        Ok – one more time:
        I have bought from you this device https://www.amazon.co.uk/gp/product/B00GX3YWNE and my intention was / is to step up from 5V to 12V.
        So I read the enclosed instructions, provide 5.0V as input and I can see input / output voltage by pressing (in) / (out) buttons on the left side on the display. Initially the output voltage as shown by the display was 4.9V. So far so good.
        Now I press the (set) button on the right and the number before decimal point starts to blink. However I cannot increase voltage above 4.9 nevertheless how many times I press the (+) button. I can however decrease to 0.0V and increase back to 3.9V the output.
        To summarize I started with 4.9V output and ended up with 3.9V – both far below the expected from me 12V.
        Please help, thanks.

      • Hello Drok support,
        I can see above my message describing the issue I have, however more than 24 later I cannot see your feedback on it?
        Thanks!

      • Hello Drok support,
        I am still waiting for your feedback on my issue above – almost a week after I received your useless piece of hardware.
        Is there anybody who read this thread and I can answer my inquiry?
        Thanks!

        • Hello Angel,
          Thank you for writing in and so sorry for our late reply.
          Since it is the vacation of Mid-Autumn Festival of China, we do not give you a reply at once.
          The product in the product link you send to us is a buck converter.
          But according to your description of the application, you need a boost converter not a buck converter.
          Please check your order again that if the link you send to us is right or not.
          Hope this can help you.
          Best regards

  55. Hello,
    I buy a your product

    DC-DC step-down 5A 12V / 24V a 5V
    https://www.amazon.it/DROK-step-down-convertitore-alimentazione-regolabile/dp/B00GY01UMC/ref=sr_1_1?s=pc&ie=UTF8&qid=1480321502&sr=1-1&keywords=DROK%C2%AE+DC-DC+step-down+convertitore+di+tensione+5A+12V+%2F+24V+a+5V+di+alimentazione+Buck+regolabile+Modulo+Volt+Regolare+Meter

    The product has the CE Declaration of Conformity?
    I can have a copy of the conformity to see if I can use it in my application?

    Many thanks

    • Hello sviluppo_ict,
      Thank you for writing in.
      The CE Declaration of Conformity is on the road.
      We are trying our best to apply the CE certification but this process is complicate and needs a lot of time.
      Sorry for the inconvenience caused on you.
      Hope you can understand.
      Best regards

  56. Hi ,
    I sent an email too Service@droking.com on november 24 and I still haven’t receive an answer. I want to order around 30 LCT1871 per year and it is not available anymore on amazon.ca. I wrote a question on amazon and I was told to contact you via email for this type of inquiery. Please answer my email.

    • Hello Jean-Gabriel,
      Thank you for your interest in our product.
      We have checked our email history that we cannot find your email.
      Could you please try to send the email to us again?
      Sorry for the inconvenience caused on you.
      Best regards

  57. have receive this item this morning DROK® 12V to 5V Numerical Control Step Down Voltage Regulator 5A 5-32V to 0-30V DC Adjustable Digital Control Buck Power Converter NC Constant Volts / Amps Voltage Reducer, LED Ammeter Voltmeter

    but the pronbleme is the device doesnt see the amp and wathever i do it just can give .9 amp (test with multimeter)

    have try defferent power source with different volt and amp

    • Hello Nicolas Gervais,
      Thank you for writing in.
      And since there are many products with similar titles, it’s hard for us to ensure the product.
      Could you please tell us your order ID or the link of product so we can ensure which product you received?
      And it is better that you can tell us more details of your operation, such as the input voltage/current, the load, the wiring, the working environment.
      If you can, we sincerely hope that you can send us some images or video to let us check the problem details.
      With your help, we can find a solution more quickly.
      Best regards

  58. Hi folks! I bought this: https://www.amazon.com/gp/product/B00HHQ0VP4/ref=as_li_tl?tag=proeng-20&keywords=buck%2Bconverter&th=1
    Quick question: my input voltage is 12v. I want to step down to 5v. No matter how I adjust the two pots, it never changes (output reading 12v).

    Is there some trick to adjusting output voltage? Are there instructions anywhere on how to use this?

    • Hello Kris,
      Thank you for writing in and sorry for the inconvenience caused on you.
      Could you please try to counter clockwise adjust the output voltage potentiomenter for more than 10 laps until the value of the output voltage change?
      And then you can adjust the output voltage potentionmeter to adjust the output voltage to your need.
      Please note that when you adjust this potentiometer, you do not need to connect a load.
      Hope this can help you.
      If the output voltage still does not change, please feel free to write back to us.
      Best regards

  59. I have bought a few of your products and enjoy them very well they’ve done above and beyond what I need them for . But I’m looking for a step up from a low voltage (3-4v) to a constant 12-15v do you have a product like this if so email me a couple links please so I can get them order asap please and thank you for your great products and service

    • Hello Nick Grivois,
      Thank you for your appreciation.
      We are so glad that the product can meet your demand.
      Could you please tell us more details of your need, such as the input current, the load, the working environment?
      With this information, we can recommend a more suitable product to you.
      Waiting for your reply.
      Best regards

  60. What do you need to do with the jumper on the back of the YH10063D power converter for it to accept the 8-16v?

    • Hello Brian Webb,
      Thank you for writing in.
      Since the “YH10063D” may be just a part number of one of the component, it is hard for us to ensure which product you are referring to.
      Could you please tell us your order ID or the link of the product so we can ensure which product you are referring to?
      With your help, we can find a solution more quickly.
      Best regards

  61. Hello, I ordered a DC 100 A ampere meter from Amazon, it does not work properly, the display does not stabilize properly and I can not read the indications of it,
    Would you have an explanation for this problem?
    I specify that I am looking for an ammeter that works for a battery, in charging or discharging mode, so that this ammeter must operate in positive or negative display,
    Thank you for your feedback.

    bonjour, je vous ai commandé un ampéremetre DC 100 A auprés d’Amazon, il ne fonctionne pas correctement, l’affichage ne se stabile pas correctement et je n’arrive pas a lire les indications de celui ci,
    auriez vous une explication a ce probléme ?
    je précise que je recherche un ampéremetre qui fonctionne pour une batterie, en mode charge ou décharge, il faut donc que cet ampéremetre fonctionne en affichage positif ou négatif,
    merci de vos retours.

    • Hello ALAIN,
      Thank you for writing in.
      Could you please tell us your order ID or the link of the product so we can ensure which product you have purchased?
      It is better that you can tell us more details of your operation, such as the input voltage/current, the load, the wiring, the working environment.
      If you can, we sincerely hope that you can send us some images or video to let us check the problem details.
      With your help, we can find a solution more quickly.
      You can send this information to us via email(service at droking dot com).
      Look forward to hearing from you.
      Best regards

  62. Hi,

    I have one process where I need to measure a resistance of 100Ω ± 5%.

    Did you have some ohm meter or something similar to a panel display that measures that range?

  63. Rodolfo Mendoza Montano

    HI
    Thank you!
      I bought this product in amazon, https://www.amazon.com/DROK-External-Automotive-Adjustable-Consumption/dp/B017GZW0WW/ref=sr_1_40?m=AFHAE9RJVUMB&s=merchant-items&ie=UTF8&qid=1484095861&sr=1-40 , but it has no instructions, could send me an email with instructions.

    I need a timer circuit, which fulfills the following function, I have a car with a diesel engine, to which I have made all the electricity myself, now I want to put a timer that when opening the key disconnect the loads, the coils of the relays Fans, air conditioner and cabin fan and that only 30 seconds after starting the engine connect them, that way we take care of starter, alternator, battery and motor. I found that circuit in amazon and I only lack the instructions to program it, but it does not bring them. Can you send them to me
      Thank you.
    Saludos
    Yo he comprado este producto en amazon, pero no tiene instrucciones, podrían enviarme un email con las instrucciones.
    Yo necesito un circuito temporizador, que cumpla la siguiente función, tengo un auto con un motor diesel, al cual le he hecho toda la electricidad yo mismo, ahora quiero ponerle un temporizador que al abrir el chucho desconecte las cargas, las bobinas de los relays de los electroventiladores, el aire acondicionado y el ventilador de cabina y que solo 30 segundos después de haber arrancado el motor los conecte, de ese modo cuidamos motor de arranque , alternador , batería y motor. Encontré ese circuito en amazon y solo me faltan las instrucciones para programarlo, pero no las trae. Pueden enviármelas
    Gracias

    • Hello,Rodolfo Mendoza Montano
      Thank you for writing in.
      We appreciate your purchase and we are sorry for any inconveniences caused on you.
      We will send the instruction to your email, please check it.
      Best regards

      • Rodolfo Mendoza Montano

        Thank you for sending me the instructions .. They have been very efficient.
        I have programmed in p3.2 op to 42 seconds, cl to 9.9.9 hours and lop —. Simply when opening the battery energizes the circuit and this relays the relay for 42 seconds, of them 12 the spark plugs and 30 motor on, then the relay is disconnected and this by NC connects the relay coils of air conditioners And cabin fan, protecting the starter, battery and alternator of these loads in conjunction with the starter
        In addition to being told how long the car is on
        Thank you very much
        thanks for help

        • Hello Rodolfo Mendoza Montano,
          Thank you for your reply.
          We are glad that we can help with you.
          If there is any more question, please feel free to contact us.
          Best regards.

  64. Dear DROK Team,
    I need 34 digital voltage/current/power meters capable to (1) measure negative current and (2) trigger a relay at preset low voltage value. Do you have something suitable you could offer me.
    Your Digital AC/DC Multimeter 4 Data Display Voltage Current Power Energy looks very nice but is it feasible to achieve (1) and (2).
    Thank you.

    • Hello Yordan Dingilski,
      Thank you for your interest in our product.
      Since it is the vacation of China Spring Festival, our technicians are out of office so we cannot provide a recommendation to you until 4th, Feb.
      Could you please wait a few days to 4th,Feb?
      We will give you a reply as soon as possible.
      Beg your understanding and forgiveness.
      Best regards

      • Hello,
        Thank you for your reply. I’ll wait till the end of the Spring Festival 🙂

        • Hello Yordan Dingilski,
          We are sorry to keep you waiting.
          To give you a suitable recommendation, could you please tell us more detail about other parameters? For example, the measuring range of voltage/current, etc.
          And could you please send the link of the product “Digital AC/DC Multimeter 4 Data Display Voltage Current Power Energy” you mention?
          It’s hard to confirm which product you mention, as there are many similar titles.
          Beg your forgiveness and look forward to your reply soon.
          Best regards.

          • Hello,
            This is the product I meant:
            https://www.amazon.co.uk/gp/product/B017NFJHTO/ref=as_li_tl?tag=proeng01-21&keywords=digital+multimeter

            Something similar which is capable to (1) measure negative current and (2) trigger a relay at preset low voltage value would be great. The system I need it for is an off-grid PV system with charge controller which manages the battery charge process. As there are moments when the load power is less than the charging power I need it to measure negative current as well. Function (2) is necessary in order to disconnect additional loads at preset Low voltage value which corresponds to certain SOC (batteries State Of Charge).
            The system maximum voltage is 35V. The maximum current is 45A.
            Thanks.

          • Hello Yordan Dingilski,
            Thank you for your reply.
            We are sorry that the item you mention can’t achieve this two functions you mention.
            And it’s a pity that we don’t have such a item can meet your demand.
            Hope you can understand.
            If there is any more question, please feel free to contact us.
            Best regards.

  65. Hi,

    i have one of these:

    https://www.amazon.co.uk/Regulator-Voltmeter-Adjustable-Stabilizer-Experimental/dp/B00GX3YWNE/ref=cm_cr_arp_d_product_top?ie=UTF8

    (LM2596 board)

    The voltage seems to spike very high when switching on for a small time. I have fried a few LEDs like this, is this normal behavior? I’m stepping down from 24v to around 3v

    • Hello Stuart,
      Thank you for writing in.
      We are sorry to hear that.
      But there are something you may ignore.
      LED is drived by constant current, but the LM2596 board can only offer constant voltage.
      So it isn’t suitable to connect LED.
      Hope this can help you.
      Best regards

  66. Greetings Drok,

    I recently purchase from Amazon the DROK DC 3-21V Load Battery Tester, 35W 3A Portable USB Monitor. Every port on this product functions as designed except the iPhone 5S port. What is your procedure for returning this product for repair or exchanged.

    On another note, this is one of the BEST products I have purchased for my personal electronic shack – I also purchased the Numerical Control Voltage Regulator DC 6-55V to 0-50V 2A Buck Converter Module and the DC 0-120V 0-100A Digital Multimeter Charge-Discharge Battery Tester. The quality and functionality in each of these products is GREAT!

    I will not stop only with these products purchased.

    Thank You.

    Best Regards.

    • Dear friend,
      Thanks for your message.
      We sincerely appreciate your purchase and support.
      We are sorry that this item can’t meet your demand.
      If it can’t work for you, could you please contact Amazon service to return it?(Because your order is sold by DROK and fulfilled by Amazon.)
      And we are so glad to do business with you.
      Hope we can service you again.
      Best regards

  67. Hii, i am looking for a dc to dc boost voltage converter with a peak output voltage of 120V , can you guide me to a product you might have ?

    • Hello Sarath,
      Thanks for writing in.
      We appreciate your interest on our product.
      We have many kinds of converter, but so far we are sorry we don’t have one that can output 120v.
      Beg your forgiveness.
      We are striving to improve our item and service.
      Look forward to more cooperation in the future.
      Best regards.

  68. Jean-Claude Arroyas

    Hello. I integrate your converter (DEOK DC Convertisseur de Tension 12V/24V to 48V Régulateur Boost Chargeur de Voiture Réglementé Alimentation DIY 10-32V à 36-60V) into a solution which I market and I wish to know if you plan to maintain his its marketing or if I shall have to make stocks. Beforehand thank you.

    • Hello Jean-Claude Arroyas,
      Thanks for your writing in.
      So far this item is in good sale, We will maintain its marketing.
      But we can’t also promise anything,after all, we cann’t forecast what will happen in the future.
      Beg your forgiveness and hope you can understand.
      Best regards

  69. Hi Drok,

    Looking for your Drok DC/DC Converter 12/24V Input, and 5V10A Max Output….. needing a price for 20-30 quantity.

    This is an URGENT request. Please contact us if necessary 1-480-388-9971. Much appreciated, Carmen

    • Hello Sun-Chlor,
      Thanks for writing in.
      We are glad to receive your inquiry.
      Could you please contact us by Service at droking.com(please replace at with @).
      Best regards.

  70. Do you make a PWM controller with a constant voltage output (12V) but with an adjustable current limiter? I would like to maintain 12V but be able to adjust the current available from about 8 amps down to .25 amps or so.

    • Hello Clay,
      Thank you for your writing in.
      We are sorry most of our PWM controllers can’t maintain constant voltage.
      We will reflect this to our technician and try to improve our item to give you a best service.
      Look forwards to more cooperation in the future.
      Best regards.

  71. Hi DROK,
    I Looked at the dc-dc converter on amazon store (https://www.amazon.it/Convertitore-regolabile-efficienza-alimentatore-stabilizzato/dp/B00H09HO2Q/ref=sr_1_41?s=electronics&ie=UTF8&qid=1488541716&sr=1-41), but I would like to buy prodctodc.com (http://www.prodctodc.com/dc-adjustable-buck-voltage-regulator-8a-100w-adjustable-dc-step-down-convert-battery-buck-3351224v-power-supply-p-249.html#.WLlOzVfD1hE), the product cod. are same.

    I noticed That the components in the image are differents.

    The products are same?

    Best regards.
    Nicola

    • Hello Nicola,
      Thank you for your writing in.
      According to the description on prodctodc.com, it looks like the item is the same as our item.
      However, as this item is not from us, we can’t get further information about it. Therefor we are sorry we can’t promise they are completely the same.
      Beg your forgiveness and hope you can understand.
      Best regards.

  72. Hola donde podría adquirir una caja de preinstalacion para multimetro digital data 4 DisplayPort?.. Gracias

    • Querido amigo,
      Gracias por escribir.
      ¿Podría usted por favor haganoslo saber que tema que mencionas?
      Hay muchos títulos similares para nuestro tema, lo sentimos no podemos confirmar el tema.
      ¿Podría, por favor, envienos la referencia del tema?
      Saludos.

      Dear friend,
      Thank you for writing in.
      Could you please let us know which item you mention?
      There are many similar titles for our item, we are sorry we can’t confirm the item.
      Could you please send us the link of item?
      Best regards.

  73. Hola que tal muy buenas tardes
    Soy Mauricio Cruz de Mexico solicitando informes de cotizacion y distribuidor en Mexico del siguiente articulo el cual necesitamos en nuestra compañia y lo encontramos en AMAZON

    DROK® Salida a prueba de agua adjustable Regulador de voltaje DC Buck Convertidor 8 – 22V al transformador 1 – 15V 5V 12V 3A Fuente de alimentacion Step-down Junta Modulo Volt para el coche auto Motor Vehicle Regulado SR
    Requiero 10 piezas inicialmente

    Agradezco su atencion y quedo a la espera de su respuesta

    • Buenos días Mauricio Cruz Valdez,
      Gracias por escribir.
      ¿Podría contactarnos por medio del servicio # droking dot com (por favor, reemplace # con @)?
      Además, hay demasiados títulos similares para el artículo, no podemos cerciorarnos del artículo que usted menciona.
      Si puede, por favor envíe el enlace del producto a nuestro correo electrónico.
      Espero su respuesta.
      Atentamente.

      Hello Mauricio Cruz Valdez,
      Thank you for writing in.
      Would you please contact us through service#droking dot com ( please replace # with @) ?
      In addition, there are too many similar titles for item, we can’t make sure the item you mention.
      If you can, please send the link of product to our email.
      Look forward to your reply.
      Best regards.

  74. People complained about the startup sound, and connection tones. Have these been removed from the latest mini amps you are selling on Amazon?

    DROK® Mini Stereo Audio Wireless Bluetooth Amplifier Digital Signal Power AMP Electrical Portable DIY 30W*2 Two Channel Amplifier Board Module Aluminum Body with UK Power Adapter for Speaker Auto Car Motorcycle Tablet PC Smartphone TV Iphone iPad iPod Laptops with Bluetooth (Blue)

    OR, do these still have the annoying start up sound?

    There is also this version:

    Yeeco Hifi Mini Bluetooth Amplifier 50W+50W DC 9-24V Dual Channel Wireless Bluetooth Stereo Audio Receiver Power Amp Ampli Board with UK Power Supply Adapter for Home Sound Audio System Computer Laptop (Red)

    has this 50w version had the start up music and connection music removed??

    thanks

  75. I recently purchased 2 voltage boosters from your company, and unfortunately when I connected a digital voltage reader to the output terminals, and turned the potentiometer that regulates output voltage, there was no change in the output voltage. The same problem was observed on both boosters. I’m not sure what to do now as I need them for a project that will be competing in a few days.

    • Hello Brian,
      Thank you for writing in.
      To find out solution for you, would you please tell us which voltage boosters you are mentioning?
      Just send us the link or ASIN. And please tell us more details about your operaton, for example input voltage/current, wiring, working environment and etc.
      It would be appreciated if you can take some pictures or a testing video to show your problem.
      You can send them to service#droking dot com ( please replace # with @). There we can contact with you in time.
      Look forward to your reply.
      Best regards.

  76. DROK,

    Fantastic website/product lines ! Brilliant feedback loop for improving products as well !!!

    Does your “DROK AC 100-300V 100A Digital Voltage Current Multimeter LCD Volt Amp Meter Gauge Panel Tester Voltage Amperage Dual Display Power Monitor” work with any low cost dataloggers ?

    How would you suggest I use your products with a low cost data logger like this product [web page link removed]

    So customers can review , analyse, chart the data that is outputted… Big opportunity for customers who want to monitor and control electrical loads.

    Thanks You !

    • Hello Mark Miller,
      Thanks for writing in.
      We are sorry the meter you mention doesn’t have interface for data transmission.
      Therefore it can’t be use with data logger. Hope you can understand.
      Best regards.

Leave a Reply

Your email address will not be published. Required fields are marked *