Transformer Wiring

[JRKO]

I have a little transformer that o need to use +12v - 0v - -12v

I have 2 12v windings labeled:

0-12v (ORG. YEL)
0-12v (BLK. RED)

To get my desired output am I correct in saying connect ORG & BLK together to create the 0v?

 

[diyMartin]

Hi JRKO


I would assume that the two windings has been written in same order phase wise.
So my first attempt would be to connect YEL to BLK for the center tab - alternatively RED to ORG.
To verify: If correct the voltage between the two unconnected tabs will be 24V - if not 0V.


Cheers, Martin

 

[newvirus2008]

Adding the windings in series should return double the voltage if polarity is correct and 0V (or few mV) otherwise.

 

[rayma]

Traditionally, the brighter color is the + end (or phase dot), so as a guess
assume yellow is + and orange is -. Also assume red is + and black is -.

Then connect the orange and red together, and see if the voltage
between yellow and black is 24V. If so, the connection is correct.

 

[Altes]

To get a CenterTap I would connect 2 and 3 to get the windings in series BUT, would it make a difference
if 1 and 3 were to make the series connection as CT or 1 and 4 as CT? The windings would all still be in series.

 

[diyMartin]

1+4 would work just as well as 2+3 as CT.

1+3 or 2+4 as CT would due to the phase of the windings cancel out the voltage between respectively 2 and 4 or between 1 and 3.
This would be the same as connecting minus to minus or plus to plus when connecting batteries in series.

Cheers, Martin

 

[Altes]

Thanks, so if I'm not shure which lead is which, I make a connection
and just measure the result.

 

[diyMartin]

Yes - that will work
I would though verify that the leads are not connected internally in the transformer before connecting them together.
It may create some "interesting" sparks if you for example by accident connect 1 to 2.

Cheers, Martin

 

[Altes]

Right, I have identified the 2 pairs of 15V windings Brown+Black and Red+Green so for
CT: Brown or Black and Red or Green. The DMM will give me the truth.

 

[JMFahey]

Surprised nobody corrected you:
Transformers have AC output , no DC, so you can NOT have:

need to use +12v - 0v - -12v

Please detail better what is the desired purpose, a supply schematic, etc.