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</o:shapelayout></xml><![endif]--></head><body lang=FR-CA link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><pre><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Working hard to find a solution to adequately<o:p></o:p></span></pre><p class=MsoNormal>shield my Wah’s inductor from any induced 60hz HUM<br>coming from surounding transformers here is what I finaly did :<br><br>Remove almost all of my AC power transformers (kept only one)<br>and replace them by a small SMPS multiple output 9VDC supply.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’ve been able to shield acurately the inductor using a small piece of car shelter pipe (iron/steel aloy)<br>cut the lenght I needed and ended (welded) with a small<br>nickel coin. (YES a nickel coin !) Grounded with a small wire<br>and placing it over the small inductor, That made the trick !<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><img width=280 height=251 style='width:2.9166in;height:2.6145in' id="Image_x0020_1" src="cid:image003.jpg@01DAD69E.EC5D5F50"><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m now happy with the final result.. (No expensive MuMetal $$$ solution).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>JP<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>****************************************************************<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> I have a guitar pedal board that uses 8 pedals.<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> The first pedal (receiving the guitar) is a Jim Dunlop Cry Baby Wah-Wah.<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> The following pedal is a switchable overdrive with high gain.<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> Then the pedal chain goes on with 6 other pedals to a final tuner that drives a guitar amplifier. Ok.<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> 4 of these pedals are powered with there separate AC supplies (9VAC, 9VAC, 7.5VAC & 22VAC).<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> The other pedals are powered using 9VDC standard BOSS supplies.<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> Here is my problem :<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> Since the Wah-Wah is connected at the ‘head’ of the pedal chain and uses an internal 500mH inductor in its circuit<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> it acts like the secondary of a transformer picking up 60Hz<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> from all the nearby transformers of the board.<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> I had to unsolder the inductor from the inside PCB and,<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> using short lenghts of wires connected to it … place it in the Wah-Wah housing<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> at a ‘specific’ place and angle to get the less 60Hz pickup.<o:p></o:p></i></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";mso-ligatures:none;mso-fareast-language:FR-CA'>><i> This is annoying.. <o:p></o:p></i></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>