[sdiy] Analog Modeling, with a computer!

[Richard Wentk]

At 21:05 14/09/2005, Antti Huovilainen wrote:
>On Wed, 14 Sep 2005, Richard Wentk wrote:
>
>>This *will* affect the sound, often noticeably. So the only way to really 
>>model a physical circuit is to replace all the ideal components with 
>>nominal R+L+C+noise network models, and then add some extra mostly-C, 
>>some R and
>
>I often hear statements like this, but I've yet to see any of them backed 
>up by hard data (such as a listing with values for a typical poly* 
>capacitor at audio frequencies). So excuse me, if I remain skeptical.

You'll find the L+ Series R + Leakage R equivalent circuit for capacitors 
in any decent electronics textbook. It's most applicable to electrolytics, 
which are light years away from being ideal. But it can also be relevant 
for other types.

It's also easy to check the differences empirically. Breadboard a filter, 
and try different kinds of capacitors with identical nominal values in the 
audio chain.

Hear a difference?

Richard