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+12v/ -12v

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sigma

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I'm building an audio amp.
and needed to know if I could use this power supply.

tnx.
 

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Use a centre-tap transformer. The centre-tap will form Ground terminal. Connect other two terminals to the bridge. The + outptu of bridge goes to 7812 and - to 7912.
 
Your circuit can't work. Here is two version of dual supply,or use a center-tapped trafo as Kinjal wrote.
 

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