<div dir="ltr">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.<div><br></div><div>MC</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 13, 2024 at 10:16 PM brianw <<a href="mailto:brianw@audiobanshee.com">brianw@audiobanshee.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">I was going to recommend moving all of the transformers far away from the pedal board, and then run longer power cables for the low-voltage supplies. Although many of your supplies are AC, I'm assuming that there's far more EM coming directly from the transformer windings than from the cables that carry AC power.<br>
<br>
I'm biased, though, because I always prefer to simplify the power when combining lots of little pedals.<br>
<br>
Brian<br>
<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>
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