12V Regulated Power Supply Questions !!!

adrianbodor · 24th September 2004, 11:30 AM

I have one toroidal transformer 2x12VAC @ 0.63A - 15VA, 7.5VA each winding.

I want to use one winding from the transformer and put it into a full wave bridge rectifier then I'll have 16.9 VDC without diodes losses. I thinck this voltage is good to work with the regulator 7812 ?

My questions are:

What happens with current, is still remains at 0.63A after regulation ?

How can I calculate the output current, because I need to build a circuit and it need only 150mA @ 12VDC

Please help !!

runebivrin · 24th September 2004, 12:49 PM

No need to worry. 0.63 is max current the transformer can supply continously. Your circuit will use 150mA, and you'll have a nice safety margin.

Rune

24th September 2004, 11:30 AM	#1
adrianbodor diyAudio Member Join Date: Jul 2004 Location: Romania	12V Regulated Power Supply Questions !!! I have one toroidal transformer 2x12VAC @ 0.63A - 15VA, 7.5VA each winding. I want to use one winding from the transformer and put it into a full wave bridge rectifier then I'll have 16.9 VDC without diodes losses. I thinck this voltage is good to work with the regulator 7812 ? My questions are: What happens with current, is still remains at 0.63A after regulation ? How can I calculate the output current, because I need to build a circuit and it need only 150mA @ 12VDC Please help !!

24th September 2004, 12:49 PM	#2
runebivrin diyAudio Member Join Date: Jul 2003 Location: Huddinge, Sweden	No need to worry. 0.63 is max current the transformer can supply continously. Your circuit will use 150mA, and you'll have a nice safety margin. Rune __________________ Do wizards use spell checkers?

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