<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><br></div><div>paul perry Melbourne Australia</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Jun 15, 2024 at 5:18 AM Tom Wiltshire <<a href="mailto:tom@electricdruid.net">tom@electricdruid.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;">Yes, exactly!<div><br></div><div><div>Tom</div><div><div><div><br></div>
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<div><br><blockquote type="cite"><div>On 14 Jun 2024, at 19:29, Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca" target="_blank">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"><span>This schematic is a later generation… with input buffering :<u></u><u></u></span></div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span><u></u> <u></u></span></div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span><span id="m_5674916687686823628cid:image001.png@01DABE67.528AADA0"><image001.png></span></span><span><u></u><u></u></span></div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span><u></u> <u></u></span></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:rgb(225,225,225);padding:3pt 0cm 0cm"><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><b><span lang="FR">De :</span></b><span lang="FR"><span> </span>Tom Wiltshire <<a href="mailto:tom@electricdruid.net" target="_blank">tom@electricdruid.net</a>><span> </span><br><b>Envoyé :</b><span> </span>14 juin 2024 13:52<br><b>À :</b><span> </span>Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca" target="_blank">jpdesroc@oricom.ca</a>><br><b>Cc :</b><span> </span><a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a><br><b>Objet :</b><span> </span>Re: [sdiy] Jim Dunlop Cry Baby Wah-Wah.. 500mH inductor replacement with an inductor simulator circuit.. Feasable ?? follow up..<u></u><u></u></span></div></div></div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></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.<u></u><u></u></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></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.<u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></div><div><blockquote style="margin-top:5pt;margin-bottom:5pt" type="cite"><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 href="mailto:synth-diy@synth-diy.org" style="color:blue;text-decoration:underline" target="_blank">synth-diy@synth-diy.org</a>> wrote:<u></u><u></u></div></div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></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 :<u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><b><i><span style="color:rgb(85,142,213)">…..<span> </span>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></i></b><u></u><u></u></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.<u></u><u></u></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.<u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><b><i><span style="color:rgb(85,142,213)">…..<span> </span>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></i></b><u></u><u></u></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<u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><b><span style="color:red">The 4 x AC powered pedals :</span></b><u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><b><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></b><u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><b><span style="color:red">1 x Blackstar DS2 powered by 16VAC (no possible DC powering):</span></b><u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><b><image001.png></b><u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><b><span style="color:red">1 x Electro Harmonix Hum Debugger pedal powered by 7.5VAC (no schematic available)</span></b><u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></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.<u></u><u></u></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.<u></u><u></u></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..)<span> </span><u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif">And again, this is not a ground loop problem..<u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><image004.jpg><u></u><u></u></div></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></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" type="cite"><div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div></div><div><blockquote style="border-style:none none none solid;border-left-width:1pt;border-left-color:rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0cm 5pt 4.8pt" type="cite"><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..<span> </span><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><u></u><u></u></p></blockquote></div></div></blockquote></div><div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div></div></div></div></div><div style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:9pt;font-family:Helvetica,sans-serif">________________________________________________________<br>This is the Synth-diy mailing list<br>Submit email to:<span> </span></span><a href="mailto:Synth-diy@synth-diy.org" style="color:blue;text-decoration:underline" target="_blank"><span style="font-size:9pt;font-family:Helvetica,sans-serif">Synth-diy@synth-diy.org</span></a><span style="font-size:9pt;font-family:Helvetica,sans-serif"><br>View archive at:<span> </span></span><a href="https://synth-diy.org/pipermail/synth-diy/" style="color:blue;text-decoration:underline" target="_blank"><span style="font-size:9pt;font-family:Helvetica,sans-serif">https://synth-diy.org/pipermail/synth-diy/</span></a><span style="font-size:9pt;font-family:Helvetica,sans-serif"><br>Check your settings at:<span> </span></span><a href="https://synth-diy.org/mailman/listinfo/synth-diy" style="color:blue;text-decoration:underline" target="_blank"><span style="font-size:9pt;font-family:Helvetica,sans-serif">https://synth-diy.org/mailman/listinfo/synth-diy</span></a><span style="font-size:9pt;font-family:Helvetica,sans-serif"><br>Selling or trading? 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