Request help w/ wiring Tranny

JazzzSpazzz · 4th February 2006, 11:51 PM

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

gfinlayson · 5th February 2006, 12:00 AM

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.

JazzzSpazzz · 5th February 2006, 12:05 AM

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

JazzzSpazzz · 5th February 2006, 02:53 AM

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

Eva · 5th February 2006, 04:45 AM

It makes sense

JazzzSpazzz · 5th February 2006, 04:02 PM

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!

gfinlayson · 5th February 2006, 06:01 PM

I've seen tapped primaries before, but thye're usually two equal windings to allow selection between US and European mains voltages.

4th February 2006, 11:51 PM	#1
JazzzSpazzz diyAudio Member Join Date: Mar 2004 Location: Connecticut	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

5th February 2006, 12:05 AM	#3
JazzzSpazzz diyAudio Member Join Date: Mar 2004 Location: Connecticut	Thanks 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

5th February 2006, 02:53 AM	#4
JazzzSpazzz diyAudio Member Join Date: Mar 2004 Location: Connecticut	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

5th February 2006, 04:02 PM	#6
JazzzSpazzz diyAudio Member Join Date: Mar 2004 Location: Connecticut	conclusion 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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5th February 2006, 12:00 AM	#2
gfinlayson diyAudio Member Join Date: Jan 2006 Location: Aylesford, Kent, England	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.

5th February 2006, 04:45 AM	#5
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	It makes sense

5th February 2006, 06:01 PM	#7
gfinlayson diyAudio Member Join Date: Jan 2006 Location: Aylesford, Kent, England	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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