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Old 4th February 2006, 11:51 PM   #1
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Question Request help w/ wiring Tranny

I just got a couple of 18V CT trannies from PE (129-086 $3.50/each). They have 3 wires on both the primary & secondary. I'm actually not sure which are which, too.

The one side has green-white-green & the other black, lt orange, dk orange.

Anyone give me a hint which is the real primary & what the 3rd wire is in the primary?

TIA,
Bret
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Old 5th February 2006, 12:00 AM   #2
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The transfornmer is centre tapped which means it has two primary windings and two secondary windings. You can connect windings in series/parallel to run split rail supplies or double up and get more current on a single rail.
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Old 5th February 2006, 12:05 AM   #3
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That makes sense. Can I assume that the center wire of the three is the center tap? Or is there a way I can measure to determine the CT?

Thanks in advance!
Bret
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Old 5th February 2006, 02:53 AM   #4
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Default Climbing the learning curve

Well, I've been reading (a dangerous activity, I know) and testing resistances. I have come up with the following conclusions 1) the green-white-green wires are the CT secondary, and 2) the primary appears to be tapped for either 110 or 100V (or just about thereabouts).

The second conclusion is based on the resistances & listed primary:
black to dark orange: 20.8 Ohm
black to light orange: 19.8 Ohm
light orange to dark orange: 1.8 Ohm

Luckily for me, ~10% difference in output V doesn't really matter. It is listed as 18V & I can use up to ~22V.

Does this make sense or am I pissin' into the wind?

TIA,
Bret
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Old 5th February 2006, 04:45 AM   #5
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It makes sense
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Old 5th February 2006, 04:02 PM   #6
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I just heard from some one who had got a similar tranny from PE--the primaries are 0-100V-120V.

I never saw a tapped primary before--I've got a lot to learn.

Thanks!
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Old 5th February 2006, 06:01 PM   #7
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I've seen tapped primaries before, but thye're usually two equal windings to allow selection between US and European mains voltages.
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