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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Dedicated Audio A/C Line posted by lenw on October 8, 2006 at 12:02:36:
We would like any ground, anywhere in the audio chain, power or signal, to be a "one way" path. Leaving aside the whole notion of "one way" with AC signals/power, how do we insure this?The answer is simple, we do what we need to, to make sure one path to ground is a lower impedance than another path. In your case you have a 10 gauge wire going to a panel. Why would noise from some other device travel through its ground wire and instead of going to normal panel/electical ground go back "upstrem" through this 10 gauge wire and co-mingle with your amp? It shouldn't "if" your electrical ground is the lowest impedance path to ground.
Now if your electrical ground is not the lowest impedance path you really should correct that. If that isn't possible then you can increase the impedance any other device would see back upstream into your amp. While I do not approve of it, or feel it is needed, proven solutions are to use a pair of back to back diodes or a resistor. In either case, these devices must be capable of handling the possible fault currents involved, which are way beyond the breaker's 20 amp rating. Instant fault currents could be upwards of many thousands of amps so don't use a 1 amp diode or 1/2 watt resistor, okay?
Honestly I don't think you have much to be concerned with. The concept of "isolated" grounds is absurd. Ground is intended to be "common" to all grounded devices and as such is never isolated in normal installations, even those with isolated ground receptacles and the like.
The real evil animal is the grounded current carrying wire, the neutral. It would be far better if we converted to 240VAC single phase gear. But that won't happen because of ignorance. Strange though that many would be willing to use balanced power. Balanced power is a wonderful idea. Just that 240VAC operation is the same and free (assume you are in USA).
Russ
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Follow Ups
- I don't know why this is so hard to understand - Russ57 20:37:39 10/08/06 (0)
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