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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Re: Many thanks for the Keys to the Kingdom posted by dhrab on March 19, 2007 at 15:09:00:
Don't mess with the house wiring.My power cords are home-made, so I don't mind modifying them. If you have fancy power cords, you can experiment by making some short extension cords and placing the anti-parallel rectifier diodes in the ground lead. This kind of thing is also good for experiments with non-audio appliances that make electrical noise. Some devices, such as UPS for computers, have ground-sense circuits and will not work with the diodes themselves. In this case, use a 1000-ohm non-magnetic resistor to shunt the diodes.
The rectifiers I use are in 4- or 6-ampere bridges I get at a local surplus electronics store, simply because they are cheap and they do not have single rectifiers of appropriate sizes. Wire the input leads together to make one terminal and the output leads to make the other. This gives two anti-parallel pairs in parallel.
The diodes do not see reverse bias, as one would always be forward-biased in a fault condition. However, the diodes have capacitance, which allows some RF noise to get through. Diodes with higher reverse-bias ratings have less capacitance for the same forward current rating. Therefore, use the highest reverse voltage rating you can find.
I've tried HexFRED diodes and did not like the result. I believe these have more capacitance than conventional rectifiers of the same rating.
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Follow Ups
- No, I put the anti-parallel diodes in the power cords. - Al Sekela 11:17:14 03/20/07 (0)
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