Center Tapped Transformer?

toufu · 11th March 2010, 04:52 PM

Is it possible to make a center tapped transformer from a transformer with 2 secondaries? If I have 2x24, can I tie the 2 wires in the middle to become the center tap and I have a 24-0-24 transformer?

coloradosound · 11th March 2010, 04:58 PM

Yes, but if using it to drive a convential full bridge rectifier, make sure
that the two single leads are out of phase with respect to each other.

toufu · 11th March 2010, 05:13 PM

Thanks for the reply but can you elaborate on that? How do I make sure they are out of phase?

bobodioulasso · 05:26 PM

If the windings are tied out of phase, you will measure 0 volts instead of 48 v across the two extremes. If so, reverse one winding . Though, generally colours tell you what is what. The center tap, in this case joins two different colours.

coloradosound · 11th March 2010, 05:23 PM

Do you have a scope?

toufu · 11th March 2010, 05:27 PM

No, I don't have a scope. I usually get my transformers from Antek, I suppose I can ask them, but do you know if their transformers are tied out of phase or not?

CBS240 · 06:11 PM

Tie two of the leads together and measure the AC voltage at the other two. If you measure mV, then you have them connected + - . - + Reverse one of the secodaries and you should see the voltage of both secondaries in series, + - . + - The connection point between them is the CT.

Peronsally, I prefer two seperate secondaries. This way I can make two seperate full bridge rectifier and filter circuits, then tie them in series at the star GND.

toufu · 11th March 2010, 08:08 PM

Thanks guys, I just call antek and they told me that just tie the two middle wires to make it a center tapped transformer.

ac15cc1x · 19th April 2011, 05:21 PM

Hello, sorry for reopening an old topic, but I have a similar question.
I have bought a Myrra 44310 transformer and it has a separate 2x15V outputs, however I need a center tap, can I just connect the two middle taps to get a center tapped transformer?

http://www.farnell.com/datasheets/41189.pdf

Minion · 19th April 2011, 11:49 PM

Yes , make sure the windings are in phaze .....

11th March 2010, 04:52 PM	#1
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	Center Tapped Transformer? Is it possible to make a center tapped transformer from a transformer with 2 secondaries? If I have 2x24, can I tie the 2 wires in the middle to become the center tap and I have a 24-0-24 transformer?

11th March 2010, 05:22 PM	#4
bobodioulasso diyAudio Member Join Date: May 2008	If the windings are tied out of phase, you will measure 0 volts instead of 48 v across the two extremes. If so, reverse one winding . Though, generally colours tell you what is what. The center tap, in this case joins two different colours. Last edited by bobodioulasso; 11th March 2010 at 05:26 PM.

11th March 2010, 06:07 PM	#7
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	Tie two of the leads together and measure the AC voltage at the other two. If you measure mV, then you have them connected + - . - + Reverse one of the secodaries and you should see the voltage of both secondaries in series, + - . + - The connection point between them is the CT. Peronsally, I prefer two seperate secondaries. This way I can make two seperate full bridge rectifier and filter circuits, then tie them in series at the star GND. __________________ All the trouble I've ever been in started out as fun...... Last edited by CBS240; 11th March 2010 at 06:11 PM.

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11th March 2010, 04:58 PM	#2
coloradosound diyAudio Member Join Date: Nov 2005 Location: colorado	Yes, but if using it to drive a convential full bridge rectifier, make sure that the two single leads are out of phase with respect to each other.

11th March 2010, 05:13 PM	#3
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	Thanks for the reply but can you elaborate on that? How do I make sure they are out of phase?

11th March 2010, 05:23 PM	#5
coloradosound diyAudio Member Join Date: Nov 2005 Location: colorado	Do you have a scope?

11th March 2010, 05:27 PM	#6
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	No, I don't have a scope. I usually get my transformers from Antek, I suppose I can ask them, but do you know if their transformers are tied out of phase or not?

11th March 2010, 08:08 PM	#8
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	Thanks guys, I just call antek and they told me that just tie the two middle wires to make it a center tapped transformer.

19th April 2011, 05:21 PM	#9
ac15cc1x diyAudio Member Join Date: Apr 2011	Hello, sorry for reopening an old topic, but I have a similar question. I have bought a Myrra 44310 transformer and it has a separate 2x15V outputs, however I need a center tap, can I just connect the two middle taps to get a center tapped transformer? http://www.farnell.com/datasheets/41189.pdf

19th April 2011, 11:49 PM	#10
Minion diyAudio Member Join Date: May 2006	Yes , make sure the windings are in phaze .....

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