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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
CGS35 Steiner Parker Filter - No Resonance
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snorkeldata



Joined: Nov 18, 2016
Posts: 5
Location: Sweden

PostPosted: Fri Nov 18, 2016 9:57 am    Post subject: CGS35 Steiner Parker Filter - No Resonance Reply with quote  Mark this post and the followings unread

Hey there fellow synth nerds!

I´m having some problem with the resonance of my Steiner Parker filter.
When I built it a year ago the resonance worked just fine. It did not scream but there was some nice resonance.
In the last couple of months the resonance seems to have been slowly dying.

Typical case:
I start the synth, lp, bp, hp is filtering fine but there is no resonance at all when I turn the Q knob.
If I poke at the 2N2222 that is in charge of resonance with my finger it starts working again.

I have tried resoldering joints, switching transistors, searching for faults on the board, measured voltages, read forum posts, checking polarity and value of stuff. Everything seems to be pretty much as it should be.

I seem to have run in to a dead end and now the resonance have stopped working all together.

Any ideas?
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