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

Mike Beauchamp list at mikebeauchamp.com
Fri Jun 14 02:43:25 CEST 2024


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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