[sdiy] Buchla Lowpass Gate Switch

[Peter Grenader]

Well, I'll tell ya...My average signal strength in my system is somewhere
around 7 volts. A Buchla's what - 2?  The thing was kazooing like a banchee
in medium to high res configurations.  So, using a divider I dropped the
amplitude at the input to 2 volts, then brought it back up at the end with
another op amp and .... problem gone.





I dropped the amplitu mark verbos wrote:

I still think the distortion is from somewhere else in the circuit. Those
op-amps have a fair amount of gain in the middle there. Especially at narrow
bandwidths, I think you may have been railing them with your 10 volt signal.
Remember that the circuit is intended for line level.

Mark


Peter Grenader wrote:
Re: [sdiy] Buchla Lowpass Gate Switch I was unclear.  I was meaning if you
overdrive a vac in general, not necessarily  in this circuit.  I've did it
on my 291 clone.  I had to attenuate the input a bunch so it wasn't kazooing
on me and then bring it back up to volume on the other end.


mark verbos wrote:

wait a second.... overdriven? Isn't it just a resistor? Something else int
he signal path must be causing that, no?

Mark



Peter Grenader wrote:
harrybissell wrote:


If you are looking for "full on" by all means blast as many photons as
possible... but
  


Careful on this.  Vactrols make anything going through them sound like a
kazoo when they are overdriven.








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