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

[Jean-Pierre Desrochers]

After reading some forums, it seems that shielding an inductor

Will change its caracteristics a lot..

If so, not acceptable for me..

 

De : Synth-diy <synth-diy-bounces at synth-diy.org> De la part de Mike Beauchamp
Envoyé : 13 juin 2024 20:43
À : synth-diy at synth-diy.org
Objet : Re: [sdiy] Jim Dunlop Cry Baby Wah-Wah.. 500mH inductor replacement with an inductor simulator circuit.. Feasable ??

 

Maybe try some magnetic shielding. I've used this product in the past with good success:

https://www.amazon.com/WOREMOR-Magnetic-Shielding-Amorphous-Alternating/dp/B08JKVMRB7

I've used this stuff to shield 60hz getting into reverb tanks, and it's actually worked better than another product called mu-metal - at least in my testing. The shit is razor sharp though, watch out.

If you're confident the inductor is picking up the interference, you can build a little shield around it it using this stuff. I'd even desolder the inductor so I can place shielding on the bottom as well. You can also use it to place shields around the AC supplies as well. 

Mike

 

 

On 2024-06-13 19:46, Jean-Pierre Desrochers via Synth-diy 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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