<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"Préformaté HTML Car";
margin:0cm;
font-size:10.0pt;
font-family:"Courier New";}
span.PrformatHTMLCar
{mso-style-name:"Préformaté HTML Car";
mso-style-priority:99;
mso-style-link:"Préformaté HTML";
font-family:Consolas;}
span.EmailStyle22
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;
mso-ligatures:none;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=FR-CA link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>After reading some forums, it seems that shielding an inductor<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Will change its caracteristics a lot..<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>If so, not acceptable for me..<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=FR>De :</span></b><span lang=FR> Synth-diy <synth-diy-bounces@synth-diy.org> <b>De la part de</b> Mike Beauchamp<br><b>Envoyé :</b> 13 juin 2024 20:43<br><b>À :</b> synth-diy@synth-diy.org<br><b>Objet :</b> Re: [sdiy] Jim Dunlop Cry Baby Wah-Wah.. 500mH inductor replacement with an inductor simulator circuit.. Feasable ??<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p>Maybe try some magnetic shielding. I've used this product in the past with good success:<o:p></o:p></p><p><a href="https://www.amazon.com/WOREMOR-Magnetic-Shielding-Amorphous-Alternating/dp/B08JKVMRB7">https://www.amazon.com/WOREMOR-Magnetic-Shielding-Amorphous-Alternating/dp/B08JKVMRB7</a><o:p></o:p></p><p>I've used this stuff to shield 60hz getting into reverb tanks, and it's actually worked better than another product called mu-metal - at least in my testing. The shit is razor sharp though, watch out.<o:p></o:p></p><p>If you're confident the inductor is picking up the interference, you can build a little shield around it it using this stuff. I'd even desolder the inductor so I can place shielding on the bottom as well. You can also use it to place shields around the AC supplies as well. <o:p></o:p></p><p>Mike<o:p></o:p></p><p><o:p> </o:p></p><p><o:p> </o:p></p><div><p class=MsoNormal>On 2024-06-13 19:46, Jean-Pierre Desrochers via Synth-diy wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>Hi list,<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>I have a guitar pedal board that uses 8 pedals.<o:p></o:p></p><p class=MsoNormal>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.<o:p></o:p></p><p class=MsoNormal>Then the pedal chain goes on with 6 other pedals to a final tuner that drives a guitar amplifier. Ok.<o:p></o:p></p><p class=MsoNormal>4 of these pedals are powered with there separate AC supplies (9VAC, 9VAC, 7.5VAC & 22VAC).<o:p></o:p></p><p class=MsoNormal>The other pedals are powered using 9VDC standard BOSS supplies.<o:p></o:p></p><p class=MsoNormal>Here is my problem :<o:p></o:p></p><p class=MsoNormal>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<o:p></o:p></p><p class=MsoNormal>from all the nearby transformers of the board.<br>I had to unsolder the inductor from the inside PCB and,<o:p></o:p></p><p class=MsoNormal>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.<o:p></o:p></p><p class=MsoNormal>This is annoying.. <o:p></o:p></p><p class=MsoNormal>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<o:p></o:p></p><p class=MsoNormal>In place of the 500mH passive inductor.. (??)<o:p></o:p></p><p class=MsoNormal>Feasable ??<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Here is the Jim Dunlop Wah-Wah schematic : <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><img border=0 width=845 height=464 style='width:8.802in;height:4.8333in' id="Image_x0020_2" src="cid:image001.jpg@01DABE57.AD732E50"><o:p></o:p></p><p class=MsoNormal><br><br><o:p></o:p></p><pre>________________________________________________________<o:p></o:p></pre><pre>This is the Synth-diy mailing list<o:p></o:p></pre><pre>Submit email to: <a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><o:p></o:p></pre><pre>View archive at: <a href="https://synth-diy.org/pipermail/synth-diy/">https://synth-diy.org/pipermail/synth-diy/</a><o:p></o:p></pre><pre>Check your settings at: <a href="https://synth-diy.org/mailman/listinfo/synth-diy">https://synth-diy.org/mailman/listinfo/synth-diy</a><o:p></o:p></pre><pre>Selling or trading? Use <a href="mailto:marketplace@synth-diy.org">marketplace@synth-diy.org</a><o:p></o:p></pre></blockquote></div></div></body></html>