[sdiy] Pole Dancing

Donald Tillman don at till.com
Tue Sep 18 23:56:24 CEST 2018

> On Sep 18, 2018, at 2:45 PM, Richie Burnett <rburnett at richieburnett.co.uk> wrote:
>> You bring up an interesting point.  What's the effect of the Moog poles being mistuned a bit?  The answer is, not much.  Worst case, you may need a little more feedback to get the job done.
> Exactly.  The effect is much more pronounced in the TB-303 filter though. Here there is no buffering between stages in the ladder and the open-loop poles are spread over more than a decade in frequency!  That's why the TB-303 filter requires so much gain in the feedback path to get it anywhere near to self-oscillation.

Hmm, try it out...  

'Anybody know the positions of the TB-303 real poles?

  -- Don
Donald Tillman, Palo Alto, California

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