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Old 1st October 2010, 11:38 PM   #11
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Quote:
Originally Posted by kropf View Post
One minor problem I see is that your supply is very unlikely to be a symmetrical +/-40V, since that depends on the capacitance on each side of the virtual ground being exactly equal all of the time.

The much bigger problem, as I see it, is that the virtual grounds from each half of the PS will see about 60VAC between them. That will cause all kinds of trouble, and especially if they ever were both connected to an external ground at the same time. Very dangerous.

Jeremy
Yep, you are right between virtual grounds 82V and load has to be perfect symmetry otherwise heavier load side collapses and lighter side gets much higher up to 84v. I am opening up the transformer to separate to make 2 independent secondaries and thinking about to making zener, triac and bjt safety circuit to short or balance load on lighter side ultimately cut off secondary from bridge. Too much ???

Last edited by birdyman; 2nd October 2010 at 12:00 AM.
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Old 2nd October 2010, 12:26 AM   #12
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Sorry to be really silly.

Don't you have 110 v supply in the states

Sort of 55+- If referenced to ground?

Why do you bother with tans formers Just stick a plug to the bridge and a few caps after that.

Just as Papa to design something with 60 70 v rails.

Here in the UK we have tons of 55 0 55 transformers that we use for power tools and they are preaty cheap Think I got a 3000VA in the loft.

Hum... (some body really claver is going to tel me to have a look at the Aleph 1.2)
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Old 2nd October 2010, 12:59 AM   #13
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ya it can be real stiff power supply just wear rubber before you play with your hand made electric chair..... oops amp. hehehe
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