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Why PAM8403 may be noisy when powered by USB

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Published on Dec 22, 2016

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When I made speakers for a computer on a PAM8403 chip, I noticed that it was noisy. Now I have found the cause of the noise. It turned out to be common-mode interference. I eliminated it using a filter from a computer power supply. Video about assembling speakers: • Speakers for a computer with USB power supply... Measurements of the current consumed by this amplifier: • Current consumption of the PAM8403 amplifier Many thanks to subscribers for actively discussing this topic in the comments. Some ideas really helped to understand the problem and find a solution :)

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