Inductor Wah Circuit

October 29, 2019

Whipple wah pedal a handmade classic worlds finest wah pedal 21500 add to cart. Thomas organ patented the wah circuit design but by the time the patent was granted there were already dozens of copies of the pedal in the market.

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The 33k resistor is in parallel with the inductor so the in circuit resistance measured across it should be lower than the inductors resistance.

Inductor wah circuit. Inductor based wah wah for this project you can replace the circuit board in your exsisting wah pedal with a very flexible great sounding circuit. Its not amazing but it didnt cost 60. Runs off a single 9v supply.

The wah wah pedal was invented in november 1966 by lester kushner and brad plunkett working at warwick electronics a division of whirlpool that owned thomas organ company and vox. Its clear from outside experimentation that adjusting other more mundane pieces of the circuit can also have a large effect on a wah wah pedals tone. Created this from a schematic i found online.

This reduced design makes the power consumption below 1ma. The inductor has a low dc resistance normally under 75 ohms. It took me a while but the trick is the wah pot the second transistor and the fixed capacitor implement an electronically variable capacitor.

Input stage and output stage. The halo inductor appeared in the original clyde mccoy wah created by the thomas organ company in 1966. It uses a dual mosfet op amp some capacitors and resistors.

Most musical electronics professionals whove looked into the wah wah pedal agree that the inductor in and of itself is not the most important piece of circuitry. This variety gets its name from its shape which is round with a hole in the center although its also known as a trash can inductor for the same reason. These are wah mods based on gerben koopmans wah.

The inductor is and remains fixed and the capacitor is electronically varied and so the circuit has a variable tuning lc filter to cause the effect. Whipple wah inductor 100k icar pot fits most wah wah pedals 4000 add to cart. The whipple pcb wah board fits crybaby vox most pedals 2500 add to cart.

The whipple halo wah inductor fits most pedals handmade in brooklyn nyc 2700 add to cart. The vox v847 circuit. The circuit is built using 2 cascaded transistor stages with a couple of passive components and an inductor.

When a wah inductor goes it usually goes open as the result of dropping the wah. The v847 simple schematic can be broken down into two blocks.