[sdiy] filter problem

[Happy Harry]

Well a schematic would be helpful in giving advice...

Its also possible (beside wiring errors) that the 1% resistors
have increased the circuit matching (higher Q) of sections and now
it oscillates.

Can you tune the oscillation ???

H^) harry


>From: robbie robot <frankentron at altavista.com>
>To: synth-diy at node12b53.a2000.nl
>Subject: [sdiy] filter problem
>Date: 30 Mar 2001 09:09:23 -0800
>
>hi,
>
>i just signed up for this list in hope somebody might be able to help me 
>with a VCF i'm building. it's a multi-mode filter using discreet 
>transisters for OTAs. anyway, the circuit worked beautifully on the 
>breadboard but now after building it on a PCB i cooked up the circuit 
>oscillates continuosly. i didn't change any parts except to use 1% 
>resisters in the VCA's instead of 5%.
>any thoughts?
>
>RR
>
>
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