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Article #15578

purpose built distortion producing circuits

#15578
From: Richard Banks
Date: Thu, 17 Dec 1992 00:14
36 lines
1882 bytes

I'm constructing a purpose built distortion producing circuit to
be used to add gain to audio signal of an electric guitar.

The circuit uses 4 stage op amp noninverting configuration to
produce a gain of 1855 running off a 9V power supply.

My problem is the unit is acting like a noise gate, when the signal
attenuates the circuit "cuts off."  Therefore it is very quiet,
but does not produce long sustain, which is what I want.

The value of the feedback resistors are 100k and the value of the
power resistors is 220 ohm.  Could it be that I should
increase the value of the feedback resistor and raise the
value of the power resistor but so that it still produces the
same amount of gain at each stage? 
I was thinking maybe my problem was that the signal was
getting "drained" by the power supply because of the low
power resistor value.

If you have any other ideas or suggestions please present them to
me.  Thanks.


Also on a side note, what is the best op amp config to use
for distortion, inverting or noninverting?

I would think noninverting, because inverting amps cause
a lot more bias current at high gain.
But Craig Anderton uses inverting amps for almost all his
signal processing designs in his projects book.
Even for the distortion circuits.

Thanks in advance.
Rich Banks.
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From: ah335@cleveland.Freenet.Edu (Richard Banks)
Newsgroups: sci.electronics,alt.guitar,rec.music.makers.guitar
Subject: purpose built distortion producing circuits
Date: 17 Dec 1992 00:14:05 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Lines: 36
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