On Thu, 01 Jul 2010 18:16:14 -0500, the renowned Ignoramus14602
wrote:

I have this rectifier: GPBC 50A

http://tinyurl.com/25fmjfu

It has four terminals, but they are not marked. The datasheet is pretty
sparse, too. Which of them are AC and which are DC?

i

The one on the chamfered corner that's at 90° to the rest is the +,
the one _diaagonally_ opposite is the -, and the other two are the AC
input terminals.

Check it on 12VDC with a small light bulb in series to be sure. You
should measure 11VDC or so out with the + terminal as I said,
regardless of the polarity of the input (and, of course, the series
light should never light up (!)).

As Ned said, this is easily figured out with a DMM that has a diode
check range, but compare it with a regular diode to be sure of the
polarity. Most digital DMMs have the red lead source positive voltage,
and most analog VOMs are the opposite.

http://www.repairfaq.org/sam/semitest.htm#sttdj

Obviously if you get it wrong you'll probably kill the bridge or cause
the capacitor to vent its lifeblood.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
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