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

[Jean-Pierre Desrochers]

Yes!

> -----Message d'origine-----
> De : rburnett at richieburnett.co.uk <rburnett at richieburnett.co.uk>
> Envoyé : 15 juillet 2024 10:21
> À : Jean-Pierre Desrochers <jpdesroc at oricom.ca>
> Cc : Synth-diy at synth-diy.org
> Objet : Re: [sdiy] Jim Dunlop Cry Baby Wah-Wah.. 500mH inductor induced
> HUM.. resolved !
> 
> 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.. _
> > ________________________________________________________
> > This is the Synth-diy mailing list
> > Submit email to: Synth-diy at synth-diy.org View archive at:
> > https://synth-diy.org/pipermail/synth-diy/
> > Check your settings at:
> > https://synth-diy.org/mailman/listinfo/synth-diy
> > Selling or trading? Use marketplace at synth-diy.org