Looks like a transformer, but..

CarlyBoy · 3rd January 2007, 05:45 PM

Hey all,

I might be an idiot. Here's the situation:

Taking stock of my transformers. Have an unusual one. One side black-white-black leads are connected. Very low resistance between the black leads (.3 ohm). Black leads are huge solid wire, looks like 14 AWG. White wire is just as thick but stranded. White-black resistance is 0.2 ohm

Other side three leads: green, green/beige, beige. Green/beige is CT because resitance is less between it and each of the others. (Curiously the beige wire has much less insulation and is thinner.)

Ignoring the fact I've not encountered more than two leads on a primary, I connected the AC to the black leads. Bringing up the voltage on the variac slowly causes the current draw to skyrocket past about 50V input.

Before I heave it into the bin, any idea what I've got here? Thanks..

Bernhard · 3rd January 2007, 08:18 PM

The thick leads is never the primary. It's always the thin leads.

ak_47_boy · 3rd January 2007, 10:23 PM

Quote:

Originally posted by Bernhard
The thick leads is never the primary. It's always the thin leads.

What about step up transformers?

AndrewT · 3rd January 2007, 10:45 PM

Hi,
could this be some kind of audio transformer rather than mains power?

ReidK · 4th January 2007, 02:02 AM

Quote:

Originally posted by ak_47_boy

What about step up transformers?

Yeah, it sounds like somebody has never worked on a tube amp.

Reid

DCPreamp · 4th January 2007, 02:05 AM

How about pictures?

Common-mode inductor?
Switching transformer?
Auto-former?
Buck-boost transformer?

Need more information to be of much help.

CarlyBoy · 4th January 2007, 01:54 PM

Not an output transformer. Here's a pic:

SY · 4th January 2007, 02:08 PM

Quote:

Green/beige is CT because resitance is less between it and each of the others.

Maybe. Maybe not. What's the exact resistance between green-beige and green? Between green-beige and beige? And green and beige?

Elvee · 4th January 2007, 02:10 PM

Hi

Have you tried to connect your variac on the beige (primary?) side.
LV

edl · 4th January 2007, 02:44 PM

Hi,

Maybe a transformer of a PC-UPS?

3rd January 2007, 05:45 PM	#1
CarlyBoy diyAudio Member Join Date: Aug 2006	Looks like a transformer, but.. Hey all, I might be an idiot. Here's the situation: Taking stock of my transformers. Have an unusual one. One side black-white-black leads are connected. Very low resistance between the black leads (.3 ohm). Black leads are huge solid wire, looks like 14 AWG. White wire is just as thick but stranded. White-black resistance is 0.2 ohm Other side three leads: green, green/beige, beige. Green/beige is CT because resitance is less between it and each of the others. (Curiously the beige wire has much less insulation and is thinner.) Ignoring the fact I've not encountered more than two leads on a primary, I connected the AC to the black leads. Bringing up the voltage on the variac slowly causes the current draw to skyrocket past about 50V input. Before I heave it into the bin, any idea what I've got here? Thanks..

4th January 2007, 02:05 AM	#6
DCPreamp diyAudio Member Join Date: Jun 2005 Location: Sacramento, CA	How about pictures? Common-mode inductor? Switching transformer? Auto-former? Buck-boost transformer? Need more information to be of much help. __________________ "Believers cling to the myth despite the evidence, reinterpret the myth to suit the evidence, or lie about the evidence to support the myth." "To err is human; to blame errors on external factors is even more so."

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3rd January 2007, 08:18 PM	#2
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	The thick leads is never the primary. It's always the thin leads.

3rd January 2007, 10:45 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, could this be some kind of audio transformer rather than mains power?

4th January 2007, 01:54 PM	#7
CarlyBoy diyAudio Member Join Date: Aug 2006	Not an output transformer. Here's a pic:

4th January 2007, 02:10 PM	#9
Elvee diyAudio Member Join Date: Sep 2006	Hi Have you tried to connect your variac on the beige (primary?) side. LV

4th January 2007, 02:44 PM	#10
edl diyAudio Member Join Date: Oct 2004	Hi, Maybe a transformer of a PC-UPS?