Hello Nick,

Thanks for writing in.

Do you mean you can’t boost input voltage or you can’t regulate output? 200310 is  a buck converter, it can’t increase voltage.

For any more questions, would you please tell us more details?

Best regards.

Hello P Randall,

Thanks for writing in. Is it 180081?

We have attached pdf instruction on Amazon page, here  is the link,  https://images-na.ssl-images-amazon.com/images/I/B1beMgNFeBS.pdf

Any more questions, please feel free to contact us.

Best regards.

Hello Fred，

Thanks for writing in and sorry for that.

You mention  output is set as 9V, but this is a boost converter. If input is 37.54v, output must be higher than input.

Have you try to boost voltage?

If you can, would you please tell us more details about your operation? It would be appreicat if you can show that by images or video, we can check it carefully.

Best regards.

Hello Randall,

There is A-VR potentiometer on the back of board, you can use it to calibrate displayed current。

Method: Switch to current display; Turn clockwise potentiometer until reach maximum, then check the actual output current with multimeter; turn potentiometer to make the displayed value accord with actual output。
Hope that can help you.

Best regards.

Hello Raul Ramirez,

200220 hasUART port, you can check if it meet your requirement.

Any more questions, please kindly let us know.

Best regards.

Hello Shane Kirk,

Thanks for writing in and sorry for inconvenience may cause.

Please refer to following wiring diagram.  3P connector is the other audio input. 2p connector can offer 5v output, but max  current it can draw is 100mA.

Any more questions, please feel free to contact us directly.

Best regards.