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PMA 24th May 2006 10:55 AM

Quote:

Originally posted by Eva
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.

Eva 24th May 2006 10:01 PM

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...

TonyTecson 25th May 2006 02:42 AM

funny, my dummy loads are in a tub of watter, only bubbles can be heard when the water starts to boil...

PMA 25th May 2006 06:20 AM

Quote:

Originally posted by Eva
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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