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previous: Bruce I remember reading somewhere Dave F... -- 2/22/2000 4:35 AM View Thread

Re: Yuk

2/22/2000 10:16 AM
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Re: Yuk
Some active filters use positive feedback. For example the Sallen-Key filters used in 99% of the speaker emulators. If you raise the open loop gain on such filters, the resonance peak gets narrower and higher, and then at some point it starts oscillating.  
 
I think ZVex has a fuzz box with positive feedback - but it oscillates at certain settings :)  
 
I have a schematic of a fuzz box that uses a discrete Schimitt trigger (that is it uses positive feedback to make a "comparator with hysteresis" - a ultra fuzz with built in noise gate).

 
Replies:
Carlo Dumb question...would a delay (echo... -- 2/22/2000 6:08 PM