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

Brother Theo brothertheo2014 at gmail.com
Fri Jun 14 16:54:19 CEST 2024


A few options: you can try shielding the inductor/box. use steel or even
better nu-metal for shielding. also you can replace the inductor with
shielded inductors. i'm assuming the inductor used is not shielded. There
are shielded smd inductors which would require an adapter board and some
clever mounting. I would be interested in developing a board for you if you
go that route.

--TimR


On Thu, Jun 13, 2024 at 7:50 PM Jean-Pierre Desrochers via Synth-diy <
synth-diy at synth-diy.org> wrote:

> 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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