IgorJuly 21, 2015 at 2:18 pmPost count: 0
I bought a buck voltage regulator, the one that can supply 8A.
On the back of the PCB i found two pins unconnected with near written “PWM IN”.
Can I connect a PWM signal coming from Arduino? And which one is GND or signal?
ThanksDrokKeymasterJuly 22, 2015 at 8:37 amPost count: 2971
Are you talking below one?
If yes, sorry that this buck voltage regulator cannot connect a PWM signal coming from Arduino. Our technicians are trying to upgrade this product now.
If no, please give us your order number or the product link.
Looking forward to your reply.
Thanks!IgorJuly 22, 2015 at 12:53 pmPost count: 0
The one I have is the same you showed me in the link.
So, is there any way to regulate the voltage by microcontroller?
Thanks!DrokKeymasterJuly 24, 2015 at 1:47 amPost count: 2971
Hi, please adjust the potentiometer on the board. Clockwise is step up voltage, and counterclockwise is step down. Any other questions, don’t hesitate to write back to us.
Regards.Orlando Steven FerrassoliAugust 3, 2015 at 9:53 pmPost count: 0
A little about myself, and the purpose of my inquiry.
I build mini wind turbines for educational purposes (schools, science camp projects, etc…). These mini wind turbines were very simple in the beginning, but recently I have received several requests to sell my mini wind turbines as kits. The requests came from other teachers, students and tinkerers out there.
My mini wind turbine has a small stepper motor as a generator (NEMA 17). The stepper motor produces AC, to which I apply a full bridge rectifier, making it into DC. I have measured the DC output around 60 volts maximum (I don’t know if it goes higher in strong winds) and the amps at around .092. I recently purchased a DC/DC converter from you, on Amazon. Here is the spec: “DROK® LM2596 Voltage Switching Regulator DC Converter Adjustable DC 5-40V to 1.25-37V Buck Converter 36V to 24V to 12V to 5V Volt Stabilizers Car Batt”. The package that I received came with a manual instruction paper that says SKU:090029.
I attached the rectified DC output from my mini wind turbine to the “in+” and the “in-” and set the output to 5.0 volts. For testing purposes, I attached an LED multicolored light containing 15 LED lights and it worked perfectly for a couple of hours (at night). I also attached a small DC motor 3.5 volts, and also tested another DC 5 volt motor. All of these items worked perfectly well. The motors worked OK…but not as fast as if I have connected them to a battery…which is acceptable for my demonstrations. I also connected a small 14 volt incandescent type “flashlight” light bulb to it, and the light barely lit up…it was very faint. Which tells me that the amperage produced by the mini wind turbine must be very low. (Maybe I misinterpreted the amperage reading) Your DC/DC converter did not warm up at any point during those 2 hours I was testing these things.
I would like to purchase them at wholesale price, so that I can include them in my kits. At $8.20 on Amazon, it is too expensive for me, since I would like to purchase 10 (ten) or more at a time (I have a Seller’s Permit). I also need to know your delivery times to Palmdale, CA zip code 93550.
If there is any technical information or advice regarding this Buck converter you can give me, I would appreciate it very much. I hope to purchase them on an ongoing basis.
Thank you very much, in advance
Orlando Steven Ferrassoli
Orlando@ScienceTubeToday.comDrokKeymasterAugust 4, 2015 at 3:20 amPost count: 2971
Thanks for your message. Just to confirm that the max DC output of the stepper motor is 60 volts, right? Please note that the input of our buck converter is DC 5-35V, so if the input is too high, it will be broken easily.
Please check if the input is too low when you connected a small 14 volt light bulb. If the input is too low, then you can know that the power of your generator is not enough.
Of course we can give a wholesale price for a bulk purchase. Could you tell us how many you want to buy. We still have about 400 units in amazon warehouse which can is shipped from US. If you want to buy more, we can ship it from China via DHL or other ways.
Looking forward to your reply.
DROKfoojookAugust 21, 2015 at 9:42 pmPost count: 0
How do I re-calibrate the meter reading. I apply an 5.18 Volt (measured with bench meter) DC input and the unit display 7.2V. I dialed the output to 2.7V (measuring with bench voltmeter) but the unit display 3.8V. Is the unit bad or can it be re-calibrated?