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

[brianw]

Given that the case of the Cry Baby is conductive, even moving the inductor from one position to another could change its characteristics. The case gets narrower towards one end, and moving the inductor could easily make it closer to the conductive case than it was on the circuit board. Granted, a shield would be grounded, ideally, but even an ungrounded conductor has an effect on electromagnetic signals.

I am no expert on inductors, though, so take the above as merely food for thought.

Brian


On Jun 14, 2024, at 9:37 AM, Jean-Pierre Desrochers wrote:
> 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
>  
> 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 ??