When I was burning in my Leach amp at some high power (I don't think max power) with dummy load I was able to hear the amp clearly singing. I used caps recommended by Prof Leach and I think non of them were ceramics. So what was singing and do I need to worry about this? Thanks.
Eva said:Capacitors aren't.
You might be surprised. Try it, though I believe you have already tried.
Put a wound PP or PE capacitor as for stability test at amp speaker terminals and wobble sine tones at high output voltage level, or squares. I am sure that you will hear cap sing for some types.
You're right, high value wound foil film capacitors may produce sound when subject to strong voltage swings or overvoltage, but that's not a condition likely to happen in a class AB amplifier. Note that I'm currently working into high power class D and using that kind of capacitors for output filters, but the inductors and even the heatsink insulators produce far more sound...
Eva said:Note that I'm currently working into high power class D and using that kind of capacitors for output filters, but the inductors and even the heatsink insulators produce far more sound...
I know you are, and I appreciate yourk work in the field of switched power supplies and class D amplifiers.
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