[sdiy] favorite "magical" opamp?

René Schmitz uzs159 at uni-bonn.de
Thu Oct 7 17:59:47 CEST 2010


David G. Dixon schrieb:
> This discussion has got me wondering whether the way we configure these
> opamps might not be just as (or more) important than the opamps themselves.
> I'm thinking about the value of the feedback/input resistors and the use of
> compensation caps here.

IMO same thing as with tubes. Components don't have a sound per se, only 
a circuit does. The values of external resistors/impedances vs internal 
capacitances does make a big difference for example. Try this at home 
folks: Inverting unit gain amp with an opamp. Vary R, with 10k, 100k, 
1Meg, or even 10Meg resistors. Watch it processing a squarewave signal 
and notice the differences.

Cheers,
  René




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