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Fender Vibro-Champ footswitch

12/12/2004 1:35 PM
Jim Novak
Fender Vibro-Champ footswitch
I tried building a simple SPST footswitch for my 1973 Fender Vibro-Champ vibrato control. The only problem: a loud popping noise emitted when going from open to closed circuit. What's the solution?
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12/12/2004 4:07 PM
Don Symes

A solution would be to use a relay with a 3VDC coil, powered by full-wave rectifying the 6.3VAC heater voltage (+/-3.15VAC) and filtering that with a few hundred mF of capacitor.  
Seems a little overcomplicated to me, but all I can come up with at the moment.
12/13/2004 7:36 AM
Don Symes

Another idea - you might try using a shielded twisted pair, ground the shield at the amp end only and the ground wire at both ends. I know it sounds stupid, but sometimes it works.

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