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Chip Amps Amplifiers based on integrated circuits

Audio Amplifier Module grounding help
Audio Amplifier Module grounding help
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Old 24th March 2020, 02:23 AM   #1
Aswinth is offline Aswinth
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Join Date: Mar 2020
Lightbulb Audio Amplifier Module grounding help

Hi I am relatively new to electronics so please take it easy on me.

I am building a DIY Bluetooth Speaker, everything works fine when I use my breadboard amplifier that I build using LM386. But I need a stereo output to decided to use the PAM8043 Amplifier IC. To save time I directly purchased the PAM8043 Amplifier Module from the link.

As you can see in the image (from the link) the module is powered by +5V and ground and the audio input L,R and Ground. Should I connect the audio ground with the power supply ground? My logical brain says it should not be done, but when I don't do it I get a humming noise and when I connect both grounds it the PAM8043 is getting hot. So what could be the problem here?
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Old 26th March 2020, 02:50 PM   #2
sgrossklass is offline sgrossklass  Germany
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Join Date: Nov 2004
Location: Germany
Hard to say without seeing the build and knowing how it's powered.

If you use a dedicated, galvanically isolated power supply for the power amplifier module, audio ground and power ground should be connected. If you are attempting to feed BT module + power amplifier from a single supply, they should not.

Speaker leads and power leads should be twisted.

Audio cables should be shielded.

While the PAM8403 is advertised as "filterless", it is probably a good idea to add some common-mode chokes at the output. Check results with an AM/FM radio at least.

The seller of your amplifier module may have a problem with dyslexia, asuming that the actual chip says PAM8403. Could be a knockoff chip otherwise.
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