I made a mini PA speaker system and I'm trying to track down a buzzing.
I'm using 12v as my main PSU which runs the amp then drops down to 5v to run a sound chip but IDK what to do about the humming.
I started out using a 12V to 5V car charger for my drop down (removed casing). Then I tried using a 5V regulator with a USB socket but still got buzzing. And what's weird is if I disconnect the ground on the USB socket it still plays, but how is that possible?
Then I tried using a battery jumper that has USB output and the buzzing goes away but I can only test for 30 seconds then the jumper shuts down.
The USB on the chip is it's power and programming. Maybe it might help if I solder leads from the USB on the board to its own +/- but I don't want to have to do that.... I've tried 2 different 12v to 5 volt chargers and the regulator.
I'm using 12v as my main PSU which runs the amp then drops down to 5v to run a sound chip but IDK what to do about the humming.
I started out using a 12V to 5V car charger for my drop down (removed casing). Then I tried using a 5V regulator with a USB socket but still got buzzing. And what's weird is if I disconnect the ground on the USB socket it still plays, but how is that possible?
Then I tried using a battery jumper that has USB output and the buzzing goes away but I can only test for 30 seconds then the jumper shuts down.
The USB on the chip is it's power and programming. Maybe it might help if I solder leads from the USB on the board to its own +/- but I don't want to have to do that.... I've tried 2 different 12v to 5 volt chargers and the regulator.