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| | The Technology of Wah Pedals |
 | | The original was the Vox style inductor based wah circuit, followed by others, most notably the twin-T circuit, the multiple feedback opamp active filter circuit, and most elaborate of all, the "state variable" style circuit used in the Mutron 3. |
 | | The first transistor is a block of gain to give you an active resonance, the wah pot and second transistor modulate the effective capacitance in a resonant circuit composed of the inductor and the variable capacitor. |
 | | If we were to put a second winding on a wah inductor, we could force DC through it from a current source circuit, which would force the "center" of the magnetic operation toward one or the other saturation points. |
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