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

Tom Wiltshire tom at electricdruid.net
Fri Jun 14 13:11:27 CEST 2024


+1 agree. I'd start by looking at some of the *other* pedals to see how many could be converted to standard 9V centre-negative, and then reduce the number of transformers to reduce the noise.

You could also check that the wah body is properly grounded. If it is, the inductor should be pretty well shielded - those dunlop wah pedals are in a big cast metal enclosure, right?

Finally, is this an old or a new Crybaby? The old ones are notorious for tone suck because of the circuit's loading on the guitar. The more modern Crybabies added a buffer at the front to eliminate this problem. You can test this by putting a buffer (or a buffered pedal like one of the boss boxes) in front of the wah temporarily and see if it improves the situation.

> On 14 Jun 2024, at 07:39, Michael E Caloroso via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> With so many power sources, you may be hearing a ground loop.  Never assume that the common return of multiple power sources are all the same potential.
> 
> MC
> 
> On Thu, Jun 13, 2024 at 10:16 PM brianw <brianw at audiobanshee.com <mailto:brianw at audiobanshee.com>> wrote:
> I was going to recommend moving all of the transformers far away from the pedal board, and then run longer power cables for the low-voltage supplies. Although many of your supplies are AC, I'm assuming that there's far more EM coming directly from the transformer windings than from the cables that carry AC power.
> 
> I'm biased, though, because I always prefer to simplify the power when combining lots of little pedals.
> 
> Brian
> 
> 
> On Jun 13, 2024, at 4:46 PM, Jean-Pierre Desrochers wrote:
> > 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 ??
> 
> 
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