guitar through op amp integrator/differenciator

[kerloom]

I was just wondering if anyone has modified the guitar signal using an op amp based integrator or differentiator and what effect does it has on the signal (audibly speaking)

[WangoFett]

According to wikipedia.org, an integrator would act as a low-pass filter, and a differentiator as a high-pass filter.

[frequencycentral]

THe Analog Bit Crusher is based on an integrator: http://www.diystompboxes.com/smfforum/index.php?topic=48809.0

[anchovie]

THe Analog Bit Crusher is based on an integrator: http://www.diystompboxes.com/smfforum/index.php?topic=48809.0

The integrator is part of the LFO in this case, rather than directly affecting the guitar signal.

[frequencycentral]

THe Analog Bit Crusher is based on an integrator: http://www.diystompboxes.com/smfforum/index.php?topic=48809.0

The integrator is part of the LFO in this case, rather than directly affecting the guitar signal.

I'm not so sure. C2 holds the voltage. It's basically a sample and hold circuit.

[gez]

The integrator is part of the oscillator in that 'bit crusher' circuit.

If you run a signal through an integrator then it works like a low-pass filter.  Bias is a problem, but is overcome if you use a huge value resistor from output of op-amp to signal input side of the input resistor.  Also use a FET amp and AC couple the whole thing.  Andy Flind came up with that one...a clever man.

Incidentally, OTA filters tend to work as integrators.