Commodore 64 Power Supply

[Tony Duell]

> > Sounds like you just need a single 9VAC power supply, a bridge, a
> > voltage regulator, and perhaps some caps to clean up the signal a bit.
> > The trick is to provide enough wattage.
> 
> No.
> 
> The 9VAC has to be a separate transformer winding from the one that provi=
> des=20
> the +5VDC eventually,  because of how it's used...

What about a transformer with 2 separate 9V secondary windings (not hard 
to find)? Use one for the 9V AC, the other to feed the 5V 
rectifier/regulator circuit.

I don't lnow what the maximum volage allowed between the 2 secondaries of 
small transformers is, but it should be easily enough for this application

Alternatively, you can (could?) get 'transformer kits'. A bobbin with a 
pre-wound primary winding and a pile of laminations. You wind the 
secondaries (the turns/V figure is givne in the instructions), then 
assemble the laminations.

-tony