[sdiy] compact solutions for power supplies?

[Michael Bacich]

On Mar 20, 2006, at 3:43 PM, Roy J. Tellason wrote:

>>
>> Can I make a +12-0-12 power supply using an ACin AC out wal wart?
>
> Yeah.  Use two half-wave rectifiers...

How does one calculate the necessary transformer voltage for that  
configuration?
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