Power supply for Car amp

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Where will you get your primary voltage from?

The class of amp is a seconadry to what the amps input voltage is, if it's a car audio amp 12~15v then yes, you'll get about 14+ volts D.C. from one leg of the supply in bipolar mode. I sugest you use the transfo in half duty mode it'll give you more or less the same out as a single leg, but load both seconadry instead of one.
 

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