[sdiy] Jim Dunlop Cry Baby Wah-Wah.. 500mH inductor replacement with an inductor simulator circuit.. Feasable ??

Mike Bryant mbryant at futurehorizons.com
Fri Jun 14 01:56:14 CEST 2024


Possibly, but not straightforward as both ends of the inductor are active, whereas most simulated inductors have one end grounded.

As an alternative, wouldn't it be possible to use switch mode DC supplies into the other pedals ?   The rectifier circuits in most will just pass the DC to the smoothing capacitors in the correct polarity so you just need to measure what the voltage is on that capacitor to choose the switchmode voltage for each pedal.
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Jean-Pierre Desrochers via Synth-diy <synth-diy at synth-diy.org>
Sent: 14 June 2024 00:46
To: Synth-diy at synth-diy.org <Synth-diy at synth-diy.org>
Subject: [sdiy] Jim Dunlop Cry Baby Wah-Wah.. 500mH inductor replacement with an inductor simulator circuit.. Feasable ??


Hi list,



I have a guitar pedal board that uses 8 pedals.

The first pedal (receiving the guitar) is a Jim Dunlop Cry Baby Wah-Wah.
The following pedal is a switchable  overdrive with high gain.

Then the pedal chain goes on with 6 other pedals to a final tuner that drives a guitar amplifier. Ok.

4 of these pedals are powered with there separate AC supplies (9VAC, 9VAC, 7.5VAC & 22VAC).

The other pedals are powered using 9VDC standard BOSS supplies.

Here is my problem :

Since the Wah-Wah is connected at the ‘head’ of the pedal chain and uses an internal 500mH inductor in its circuit
it acts like the secondary of a transformer picking up 60Hz

from all the nearby transformers of the board.
I had to unsolder the inductor from the inside PCB and,

using short lenghts of wires connected to it … place it in the Wah-Wah housing
at a ‘specific’ place and angle to get the less 60Hz pickup.

This is annoying..

Now I can play with a little back ground hum when the Wah-Wah is activated..
I  was wondering if I could use an active inductor simulator circuit

In place of the 500mH passive inductor.. (??)

Feasable ??



Here is the  Jim Dunlop Wah-Wah schematic :



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