Phantom Wah for guitarists

  
This is an op-amp implementation of a Vox style wah, with the inductor replaced by a gyrator circuit. With the component values given the frequency response is similar to a standard wah. By replacing one of the resistors with a potentiometer the simulated inductance can be made continuously variable.
Phantom Wah for guitarists - schematic

Currently this circuit has an unacceptable level of background hiss and is therefore reverted to experimental status. I will post a new version when I've got rid of the wretched noise.



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