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.

Hi, please check the image.

You can also follow the wiring instruction:
—————————-
Black wire(COM): the black wire is the common wire or ground wire
Red wire(PW+): red wire is power supply wire for the meter and also signal wire of voltage measurement(ensure voltage between red and black wire
is less than 30V)
Yellow wire(IN+): the yellow wire is current input terminal and should be connected to rear end of tested device(if you only use voltmeter, please
connect yellow wire with black wire to avoid digits on ammeter flashing due to external interference)
———————————————–

Thanks.

Dear friend

Do you mean the headset/speaker switcher? it is very easy to use.
let me make it more clearly.

Green plug: plug into plugged into headphone jack of computer
Black Plug: Plug into your speaker
Headset Marked: connect to your Headset.
Audio Input: connect to any audio device input. for example your ipad, phone, mp3 etc.

Now, you can press the switch button. then the headset or speaker will switch to play the music.

Best regards

dear friend

ltc 1871 input/output is common ground. so it should can work with your 6v pos ground system.

best regards

• This reply was modified 8 years, 9 months ago by  Drok.