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Old 21st December 2010, 02:44 AM   #1
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Default Bridge rectifier power source

I am having problems with a bridge rectifier power source I built. I have traced the problem to the rectifier diode I am using. My voltage going into the diode is ~25 VAC. My voltage coming out as DC should be the same, one positive and one negative, correct? My multimeter is reading negative ~29 V DC and positive ~6 V DC. The diode was spec'ed as 8 amp and 400V tolerances. Is there a possibility that there is something wrong with my circuit (I don't think so), or is this just a diode that is messed up?

Thanks
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Old 21st December 2010, 06:31 AM   #2
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I think the problem is in your measurement. You measure 29 and 6 Volts with respect to what? A bridge rectifier has only two output wires and you measure between them.
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Old 21st December 2010, 07:06 AM   #3
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(25 x 1.414) - rectifier losses = 35-ish (or, 29 + 6)

Well done Sherlock!
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Old 21st December 2010, 07:19 AM   #4
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Measuring across from the positive lead to the negative lead gives me ~37 V.

My drawing says coming out of the diode should be +22V and -22V but I am using a different transformer, therefore my numbers are higher. Shouldn't my positive and negatives be equal though?
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Old 21st December 2010, 02:37 PM   #5
DF96 is offline DF96  England
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Is the centre-tap of the transformer grounded? Does it have a centre-tap? If not, you are in effect measuring via the leakage resistance of the transformer (or something).
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