[sdiy] Jim Dunlop Cry Baby Wah-Wah.. 500mH inductor replacement with an inductor simulator circuit.. Feasable ?? follow up..
René Schmitz
synth at schmitzbits.de
Tue Jun 18 15:30:32 CEST 2024
Actually pot cores have been used by Dunlop in their pre 1990s crybaby.
https://www.electrosmash.com/crybaby-gcb-95
Best,
René
Am 18.06.2024 um 01:36 schrieb BrightBoy via Synth-diy:
>
> I know there have been some companies that have offered mu-metal
> shielding kits
>
> for wahs BUT I have no idea if any of them still do these days.
>
> Let Google be your guide.
>
> Cheers,
>
> Jeff
>
> -----Original Message-----
> From: Paul Perry <pfperry at melbpc.org.au>
> Sent: Jun 14, 2024 6:26 PM
> Cc: <synth-diy at synth-diy.org>
> Subject: Re: [sdiy] Jim Dunlop Cry Baby Wah-Wah.. 500mH inductor
> replacement with an inductor simulator circuit.. Feasable ?? follow up..
>
> This may be heresy, but replacing the original inductor by a toroidal
> wound one would prevent picking up external fields.
> There are also ferrite pot cores (that's pot as in shaped like a pot)
> if you feel experimental.
> paul perry Melbourne Australia
>
> On Sat, Jun 15, 2024 at 5:18 AM Tom Wiltshire <tom at electricdruid.net>
> wrote:
>
> Yes, exactly!
> Tom
>
> On 14 Jun 2024, at 19:29, Jean-Pierre Desrochers
> <jpdesroc at oricom.ca> wrote:
>
> This schematic is a later generation… with input buffering :
> <image001.png>
> *De :* Tom Wiltshire <tom at electricdruid.net>
> *Envoyé :* 14 juin 2024 13:52
> *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 replacement with an inductor simulator circuit..
> Feasable ?? follow up..
> Ok, so it's clear that yours is one of the original old-school
> Crybabies. Nice.
> It may not sort out your current issue, but you should really
> try putting a buffer between the guitar and the wah. At the
> moment, that input transistor with its low impedance is
> hanging off your input signal and killing the treble, even
> when the wah is switched out of circuit (the switch only
> switches the output). That will affect the whole rest of the
> pedal chain.
>
> On 14 Jun 2024, at 15:54, Jean-Pierre Desrochers via
> Synth-diy <synth-diy at synth-diy.org> wrote:
> To answer some questions :
> */….. 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./*
> There are no ground loops in my pedal board. Unselecting
> the Wha makes the 60hz hum completely go away.
> And placing the inductor in a specific way in the Wha
> metal box almost kill completely the hum.. so no ground
> loop for sure.
> */….. 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./*
> > 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
> *The 4 x AC powered pedals :*
> *2 x LINE6 modelers that could be run using 6VDC supplies
> (they can run on 4 x 1.5vdc C cells) eliminating two
> transformers..*
> *1 x Blackstar DS2 powered by 16VAC (no possible DC
> powering):*
> *<image001.png>*
> *1 x Electro Harmonix Hum Debugger pedal powered by 7.5VAC
> (no schematic available)*
> The following pictures shows the real actual schematic of
> my Wha.
> It’s an Italian Jen Cry Baby with a FASEL branded inductor.
> The bottom picture shows what I’ve done to ‘place’ the
> inductor at the ‘sweet spot’ to get the less hum possible.
> Not bad..
> But a shielded inductor could be fine (but expensives..)
> And again, this is not a ground loop problem..
> <image004.jpg>
>
>
>
> 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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