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
|