Re: C64 power supply replacement

From: Hársfalvi Levente (
Date: 2004-01-12 10:49:44

Hi!, wrote:

> A transformer doesn't have separate taps for 9 V AC *AND* regulated 5 V :o)
> And I did put a fuse in the 9 V AC line in the schematic.

The transformer in the C64 PSU has two independent secondary circuits, 9V AC 
each. One of these circuits is rectified and regulated (5V DC), the other is 
just brought to the C64 (only a fuse is used).

See these schematics:

As you see, the two outputs (5V dc, 9V ac) are fully "independent" in the 
original PSU design. They aren't grounded together in the PSU.



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