[sdiy] Jim Dunlop Cry Baby Wah-Wah.. 500mH inductor induced HUM.. resolved !

[rburnett at richieburnett.co.uk]

Is the sweep range the same as before!?!?

-Richie,




On 2024-07-15 15:08, Jean-Pierre Desrochers via Synth-diy wrote:
> Working hard to find a solution to adequately
> 
> shield my Wah's inductor from any induced 60hz HUM
> coming from surounding transformers here is what I finaly did :
> 
> Remove almost all of my AC power transformers (kept only one)
> and replace them by a small SMPS multiple output 9VDC supply.
> 
> I've been able to shield acurately the inductor using a small piece of
> car shelter pipe (iron/steel aloy)
> cut the lenght I needed and ended (welded) with a small
> nickel coin.  (YES a nickel coin !) Grounded with a small wire
> and placing it over the small inductor, That made the trick !
> 
> I'm now happy with the final result.. (No expensive MuMetal $$$
> solution).
> 
> JP
> 
> ****************************************************************
> 
>> _ 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.. _
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