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paulsherwin · 15th Jul 2018, 10:35 am

These modules usually have a 7805 or other regulator in the power line. Do you just want to take power from the main 30V supply? A resistor will drop enough volts to stop the reg failing. I must be missing something.

I have an MP3 module in a small wooden box hooked up to the hifi system. I power it from a 20V wall wart from the junk box.

15th Jul 2018, 10:35 am	#6
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,965	Re: Dropping voltage These modules usually have a 7805 or other regulator in the power line. Do you just want to take power from the main 30V supply? A resistor will drop enough volts to stop the reg failing. I must be missing something. I have an MP3 module in a small wooden box hooked up to the hifi system. I power it from a 20V wall wart from the junk box.