Transformer question?????

chipco3434 · 22nd August 2004, 06:08 PM

I really did search but the results were inconclusive...

I have a couple of cheap frame transofrmers from PE. These one's here...12 volt center tap

When they say 12-0-12, does that mean I get 24V out? If I have two of them, how would they be wired to produce 24V. In series?

Do I follow up with the BrianGT diaghram for CT transformer rectifier board construction then? Right?really

janneman · 22nd August 2004, 06:24 PM

Depends. If you put the centre tap to gnd and use two diodes from the 12V AC pins to get DC, you get 12V * sqrt of 2 is about 17VDC minus some losses. If you use the two 12VAC pins disregarding the center tap, with a bridge rectifier, you get 24V * sqrt of 2 is about (you guessed it) 34VDC minus some losses. But, in both cases, the transformer can only deliver its rated load.

Jan Didden

22nd August 2004, 06:08 PM	#1
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	Transformer question????? I really did search but the results were inconclusive... I have a couple of cheap frame transofrmers from PE. These one's here...12 volt center tap When they say 12-0-12, does that mean I get 24V out? If I have two of them, how would they be wired to produce 24V. In series? Do I follow up with the BrianGT diaghram for CT transformer rectifier board construction then? Right?really

22nd August 2004, 06:24 PM	#2
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	Depends. If you put the centre tap to gnd and use two diodes from the 12V AC pins to get DC, you get 12V * sqrt of 2 is about 17VDC minus some losses. If you use the two 12VAC pins disregarding the center tap, with a bridge rectifier, you get 24V * sqrt of 2 is about (you guessed it) 34VDC minus some losses. But, in both cases, the transformer can only deliver its rated load. Jan Didden __________________ /Another new issue: Linear Audio Volume 3!

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