In Car PSU

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Hi,
Just building some gainclones for my brother's car. I am putting the amps in an old amp which is crap. I thought it'd have a convienient inverter in but the Toshiba TA8020 (?) chip only requires 0V-12V.

Does anyone know of a circuit that'd take +12V unreg and produce +-25V reg at power levels required for gainclones?

Thanks,
Gaz
 
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