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<p>Maybe try some magnetic shielding. I've used this product in the
past with good success:</p>
<p><a class="moz-txt-link-freetext" href="https://www.amazon.com/WOREMOR-Magnetic-Shielding-Amorphous-Alternating/dp/B08JKVMRB7">https://www.amazon.com/WOREMOR-Magnetic-Shielding-Amorphous-Alternating/dp/B08JKVMRB7</a></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.<br>
</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. <br>
</p>
<p>Mike</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2024-06-13 19:46, Jean-Pierre
Desrochers via Synth-diy wrote:<br>
</div>
<blockquote type="cite"
cite="mid:000001dabdeb$fabf3490$f03d9db0$@oricom.ca">
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<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 style="width:8.802in;height:4.8333in"
id="Image_x0020_2"
src="cid:part1.6cODCRzR.YVgX2D4L@mikebeauchamp.com" class=""
width="845" height="464"><o:p></o:p></p>
</div>
<br>
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