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Vent: Power supply hum after replacing capacitors
Make sure the new caps have the same voltage rating.
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pat7192mo ago
I fixed an old stereo amp last year and just threw in 1000uf caps I had on hand, same uf but lower voltage. The transformer started buzzing like crazy under load. Turns out I was starving the circuit during peaks. Now I always match or exceed the original voltage rating, even if the old schematics seem overbuilt. That hum you hear, is it only at high volume or all the time?
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angela_knight2mo ago
Capacitor ESR can change a lot with voltage rating too.
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