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

[Mike Bryant]

Alternative, please the inductor in a fully screened mu-metal case.   Burklin and many others make them.
________________________________
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 :



[cid:image001.jpg at 01DABDCA.72DA17F0]
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20240613/db38b7b9/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 44073 bytes
Desc: image001.jpg
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20240613/db38b7b9/attachment.jpg>