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Old 4th April 2006, 11:39 PM   #1
DcibeL is offline DcibeL  Canada
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Default Ground isolation network / power switch wiring

Hi all,

I was looking at the suggested power supply schematic for the UcD modules, and I have some questions.

The first is about the power switch. When using a DPDT switch, why are the hot and neutral lines separately switched. What benefit would this have to having the neutral always connected, and wiring the 2 poles in parallel through the hot line, thus dividing the current the amp draws between the 2 poles. I have wired my amp with 2 poles switching the hot line, and am wondering if I should have done it differently.

My other question is about the "ground isolation network". That is, the jazz between earth ground and signal ground. Would anyone care to explain just what this is doing and how it works? I have earth ground connected to only my chassis, completely isolated from everything else, however when I get an electrostatic shock from the chassis (I live in a area with quite dry air), it is audible through my speakers. Any chance that this isolation network will reduce this?

If this isolation network will not do anything to help the audibility of electrostatic shocks, is there anything I can do about it?

Thanks for reading and thanks to anyone who can help.
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Old 5th April 2006, 12:31 AM   #2
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I don't know about the grounding in the UcDs, but the idea of using a two pole mains switch is to make sure the circuit is isolated when switched off, even if live and neutral are reversed. If I were you, I'd rewire it properly.
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Old 5th April 2006, 12:43 AM   #3
DcibeL is offline DcibeL  Canada
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So it is just for a little bit of extra protection? Okay then, I will rewire the amp as this is a very simple modification.


I guess I should also note that I do not own a UcD, and am assuming that this power supply design is universal to all linear supplies.
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