Re: My Audio Buddy problem.

["Dave J" <>]

Well there must be something tricky in there 
somewhere if it turns 9 VAC into 48 VDC. Maybe
this is a voltage quadrupler circuit?

Do we know for a fact that a cheap 12VDC to 120VAC 
inverter is not a good solution?

Dave

--- "Rich Peet" <> wrote:
> Looking at the photo more I don't understand 
> why it will not work on dc.  You just need to 
> supply the correct polarity at 2.5 volts over 
> the output of those regulators.  The 4 digit 
> number on the regulator chips will tell you 
> the voltage out of them and just add 2.5 to 5.0 
> volts.  I also don't see that it would hurt it 
> to supply the wrong polarity other than to make 
> it not work.
> 
> Are you sure you supplied the correct polarity 
> when you tried it on dc?
> 
> Looks like a simple full wave bridge conversion
> from ac to dc. filtered with just 2 large caps 
> on both the + and - sides. then the outputs of 
> that go to the two regulators.
> 
> Rich




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