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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.<BR>
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I dropped the amplitu mark verbos wrote:<BR>
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<BLOCKQUOTE>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.<BR>
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Mark<BR>
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Peter Grenader wrote:<BR>
<BLOCKQUOTE>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.<BR>
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mark verbos wrote:<BR>
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<BLOCKQUOTE>wait a second.... overdriven? Isn't it just a resistor? Something else int he signal path must be causing that, no?<BR>
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Peter Grenader wrote:<BR>
<BLOCKQUOTE>harrybissell wrote:<BR>
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<BLOCKQUOTE>If you are looking for "full on" by all means blast as many photons as<BR>
possible... but<BR>
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Careful on this. Vactrols make anything going through them sound like a<BR>
kazoo when they are overdriven.<BR>
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