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<p>Actually pot cores have been used by Dunlop in their pre 1990s
crybaby.</p>
<p><a class="moz-txt-link-freetext" href="https://www.electrosmash.com/crybaby-gcb-95">https://www.electrosmash.com/crybaby-gcb-95</a></p>
<p><br>
</p>
<p>Best,</p>
<p> René<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Am 18.06.2024 um 01:36 schrieb
BrightBoy via Synth-diy:<br>
</div>
<blockquote type="cite"
cite="mid:3e68436e-fc7f-ed16-a292-7aa094b3b739@mindspring.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div
style="color:rgb(0, 0, 0);font-family:arial,sans-serif;font-size:12pt">
<p style="margin: 0.1rem 0; line-height: 1.0;">I know there have
been some companies that have offered mu-metal shielding kits</p>
<p style="margin: 0.1rem 0; line-height: 1.0;">for wahs BUT I
have no idea if any of them still do these days.</p>
<p style="margin: 0.1rem 0; line-height: 1.0;"> </p>
<p style="margin: 0.1rem 0; line-height: 1.0;">Let Google be
your guide.</p>
<p style="margin: 0.1rem 0; line-height: 1.0;"> </p>
<p style="margin: 0.1rem 0; line-height: 1.0;">Cheers,</p>
<p style="margin: 0.1rem 0; line-height: 1.0;"> </p>
<p style="margin: 0.1rem 0; line-height: 1.0;">Jeff</p>
<p style="margin: 0.1rem 0; line-height: 1.0;"> </p>
</div>
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style="border-left: 1px solid #aaa; box-sizing: border-box; padding: 10px 0 10px 15px; margin: 0;">
<p>-----Original Message-----<br>
From: Paul Perry <a class="moz-txt-link-rfc2396E" href="mailto:pfperry@melbpc.org.au"><pfperry@melbpc.org.au></a><br>
Sent: Jun 14, 2024 6:26 PM<br>
Cc: <a class="moz-txt-link-rfc2396E" href="mailto:synth-diy@synth-diy.org"><synth-diy@synth-diy.org></a><br>
Subject: Re: [sdiy] Jim Dunlop Cry Baby Wah-Wah.. 500mH
inductor replacement with an inductor simulator circuit..
Feasable ?? follow up..</p>
<p style="margin: 0.1rem 0; line-height: 1.0;"> </p>
<div dir="ltr">This may be heresy, but replacing the original
inductor by a toroidal wound one would prevent picking up
external fields.
<div>There are also ferrite pot cores (that's pot as in shaped
like a pot) if you feel experimental.</div>
<div> </div>
<div>paul perry Melbourne Australia</div>
</div>
<br>
<div class="gmail_quote">
<div class="gmail_attr" dir="ltr">On Sat, Jun 15, 2024 at
5:18 AM Tom Wiltshire <<a
href="mailto:tom@electricdruid.net" moz-do-not-send="true"
class="moz-txt-link-freetext">tom@electricdruid.net</a>>
wrote:</div>
<blockquote class="gmail_quote"
style="margin: 0px 0px 0px 0.8ex; border-left: 1px solid #cccccc; padding-left: 1ex;">
<div style="overflow-wrap: break-word;">Yes, exactly!
<div> </div>
<div>
<div>Tom</div>
<div>
<div>
<div> </div>
</div>
<div><br>
<blockquote>
<div>On 14 Jun 2024, at 19:29, Jean-Pierre
Desrochers <<a
href="mailto:jpdesroc@oricom.ca"
target="_blank" rel="noopener"
moz-do-not-send="true"
class="moz-txt-link-freetext">jpdesroc@oricom.ca</a>>
wrote:</div>
<br>
<div>
<div
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; text-decoration: none;">
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">This
schematic is a later generation… with input
buffering :</div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"><span
id="m_5674916687686823628cid:image001.png@01DABE67.528AADA0"><image001.png></span></div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
<div
style="border-style: none none none solid; border-left-width: 1.5pt; border-left-color: blue; padding: 0cm 0cm 0cm 4pt;">
<div>
<div
style="border-style: solid none none; border-top-width: 1pt; border-top-color: #e1e1e1; padding: 3pt 0cm 0cm;">
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"><strong><span
lang="FR">De :</span></strong><span
lang="FR"> Tom Wiltshire <<a
href="mailto:tom@electricdruid.net" target="_blank" rel="noopener"
moz-do-not-send="true"
class="moz-txt-link-freetext">tom@electricdruid.net</a>> <br>
<strong>Envoyé :</strong> 14 juin
2024 13:52<br>
<strong>À :</strong> Jean-Pierre
Desrochers <<a
href="mailto:jpdesroc@oricom.ca"
target="_blank" rel="noopener"
moz-do-not-send="true"
class="moz-txt-link-freetext">jpdesroc@oricom.ca</a>><br>
<strong>Cc :</strong> <a
href="mailto:synth-diy@synth-diy.org" target="_blank" rel="noopener"
moz-do-not-send="true"
class="moz-txt-link-freetext">synth-diy@synth-diy.org</a><br>
<strong>Objet :</strong> Re: [sdiy]
Jim Dunlop Cry Baby Wah-Wah.. 500mH
inductor replacement with an
inductor simulator circuit..
Feasable ?? follow up..</span></div>
</div>
</div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">Ok,
so it's clear that yours is one of the
original old-school Crybabies. Nice.</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">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.</div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
<div>
<blockquote
style="margin-top: 5pt; margin-bottom: 5pt;">
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">On
14 Jun 2024, at 15:54, Jean-Pierre
Desrochers via Synth-diy <<a
style="color: blue; text-decoration: underline;"
href="mailto:synth-diy@synth-diy.org" target="_blank" rel="noopener"
moz-do-not-send="true"
class="moz-txt-link-freetext">synth-diy@synth-diy.org</a>>
wrote:</div>
</div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
<div>
<div
style="border-style: none none none solid; border-left-width: 1.5pt; border-left-color: blue; padding: 0cm 0cm 0cm 4pt;">
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">To
answer some questions :</div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"><strong><em><span
style="color: #558ed5;">….. 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.</span></em></strong></div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">There
are no ground loops in my
pedal board. Unselecting the
Wha makes the 60hz hum
completely go away.</div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">And
placing the inductor in a
specific way in the Wha metal
box almost kill completely the
hum.. so no ground loop for
sure.</div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"><strong><em><span
style="color: #558ed5;">….. 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.</span></em></strong></div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">>
4 of these pedals are powered
with there separate AC
supplies (9VAC, 9VAC, 7.5VAC
& 22VAC).<br>
> The other pedals are
powered using 9VDC standard
BOSS supplies</div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"><strong><span
style="color: red;">The 4
x AC powered pedals :</span></strong></div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"><strong><span
style="color: red;">2 x
LINE6 modelers that could
be run using 6VDC supplies
(they can run on 4 x
1.5vdc C cells)
eliminating two
transformers..</span></strong></div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"><strong><span
style="color: red;">1 x
Blackstar DS2 powered by
16VAC (no possible DC
powering):</span></strong></div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"><strong><image001.png></strong></div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"><strong><span
style="color: red;">1 x
Electro Harmonix Hum
Debugger pedal powered by
7.5VAC (no schematic
available)</span></strong></div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">The
following pictures shows the
real actual schematic of my
Wha.</div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">It’s
an Italian Jen Cry Baby with a
FASEL branded inductor.</div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">The
bottom picture shows what I’ve
done to ‘place’ the inductor
at the ‘sweet spot’ to get the
less hum possible. Not bad..<br>
But a shielded inductor could
be fine (but expensives..) </div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;">And
again, this is not a ground
loop problem..</div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"><image004.jpg></div>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
</div>
<div
style="border-style: none none none solid; border-left-width: 1.5pt; border-left-color: blue; padding: 0cm 0cm 0cm 4pt;">
<div>
<div>
<blockquote
style="margin-top: 5pt; margin-bottom: 5pt;">
<div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
</div>
<div>
<blockquote
style="border-style: none none none solid; border-left-width: 1pt; border-left-color: #cccccc; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt 4.8pt;">
<p class="MsoNormal"
style="margin: 0cm 0cm 12pt 58.05pt; font-size: 11pt; font-family: Calibri,sans-serif;"><br>
<br>
On Jun 13, 2024,
at 4:46 PM,
Jean-Pierre
Desrochers wrote:<br>
> I have a
guitar pedal board
that uses 8
pedals.<br>
> The first
pedal (receiving
the guitar) is a
Jim Dunlop Cry
Baby Wah-Wah.<br>
> The following
pedal is a
switchable
overdrive with
high gain.<br>
> Then the
pedal chain goes
on with 6 other
pedals to a final
tuner that drives
a guitar
amplifier. Ok.<br>
> 4 of these
pedals are powered
with there
separate AC
supplies (9VAC,
9VAC, 7.5VAC &
22VAC).<br>
> The other
pedals are powered
using 9VDC
standard BOSS
supplies.<br>
> Here is my
problem :<br>
> Since the
Wah-Wah is
connected at the
‘head’ of the
pedal chain and
uses an internal
500mH inductor in
its circuit<br>
> it acts like
the secondary of a
transformer
picking up 60Hz<br>
> from all the
nearby
transformers of
the board.<br>
> I had to
unsolder the
inductor from the
inside PCB and,<br>
> using short
lenghts of wires
connected to it …
place it in the
Wah-Wah housing<br>
> at a
‘specific’ place
and angle to get
the less 60Hz
pickup.<br>
> This is
annoying.. <br>
> Now I can
play with a little
back ground hum
when the Wah-Wah
is activated..<br>
> I was
wondering if I
could use an
active inductor
simulator circuit<br>
> In place of
the 500mH passive
inductor.. (??)<br>
> Feasable ??<br>
<br>
<br>
<br>
</p>
</blockquote>
</div>
</div>
</blockquote>
</div>
<div>
<div
style="margin: 0cm; font-size: 11pt; font-family: Calibri,sans-serif;"> </div>
</div>
</div>
</div>
</div>
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<a class="moz-txt-link-abbreviated" href="mailto:synth@schmitzbits.de">synth@schmitzbits.de</a>
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