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Old October 27th 18, 07:09 PM posted to uk.radio.amateur,rec.radio.amateur.homebrew
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Default Voltage sensitivity of ceramic capacitors

In message , Gareth's Downstairs Computer
writes
Interesting thread over in rra.boatanchors suggesting that
ceramic capacitors' capacitance is voltage sensitive and
thus responsible for distortion in the audio path.


Correct. They are piezo-electric by nature. The also exhibit dielectric
absorbance which is Bad News if you use then in a peak detector or
sample and leak ^H hold.

Silver mica or polypropylene is better. Some ceramic dielectrics also
vary wildly with temperature which can also give grief and sorrow.

I imagine that a combination of dielectric absorbance and capacitance
change will give audio distortion

B
--
Brian Howie
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