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ampage archive
Vintage threads from the first ten years
Safety Pedal
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 4/15/2003 12:39 AM |
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| Soren | Safety Pedal I came up with an idea to put a high quality capacitor in an empty pedal wired in series from input to output creating a bass rolloff before hitting a distortion pedal or amp input. I removed the series input cap in my distortion pedal to reduce further bass rolloff and to increase sound quality by having only one higher quality cap in series. So the cap in this safety pedal acts to block any DC voltage going to the guitar pickups. Before use, I figured that I must connect the safety pedal into its output jack first, then plug in the other end of the cable. And vise versa when disconnecting the guitar cable. This will prevent any DC voltage from hitting ground by the sleeve of the phone plug when connecting or disconnecting. Then I thought, why not put in the ground safety feature as some people do inside their guitars ? Putting a .047uF 600V cap in series with the bridge ground in a guitar may not protect everything like the metal input jack or the pots, or again the sleeve of the phone plug itself. Putting a cap in the safety pedal would safeguard the whole guitar along with the cable. For the ground safety cap to work, I realized that the input jack to the safety pedal must be insulated from the chassis. The output jack of the safety pedal could touch the chassis for shielding this very simple circuit. Building one of these is a great idea when testing power supplies or amps in general, without having to buy an expensive wireless system. My question is, there any way to block AC on the ground path ? If you block AC on the hot path, that would prevent your signal going through! A small transformer should isolate AC right ? Am I missing anything else ? Stay safe, Soren |
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| 4/15/2003 1:40 AM |
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| Soren | AC voltage reduction on ground path I think any AC voltage coming through the ground path could be reduced by placing an extra pair of components in series with the .047 uF cap. Another .1uF 600 V cap with a paralled 220k resistor. This should bring down 120 VAC to about 40 volts AC ? Soren |
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