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   PID: SoupGate-Win32 v1.05   
   Robert Roland  writes:   
      
   > Do you have any references for this? I mean, actual facts.   
   > Have you ever seen an overvolting C64 PSU?   
      
   I found one earlier this year -- an Ismet-made wedge PSU that came with   
   a breadbox C64. The output was approaching 5.2V at the C64 end of the   
   cable under load.   
      
   Having dismantled it, the reason was that it uses a 7805 regulator with   
   a resistor divider to lift its ground reference pin a bit, and the   
   resistor values had drifted considerably. The PSU runs quite hot (not   
   helped by the heatsink and 7805 being buried in potting compound), so   
   this isn't terribly surprising after 40 years.   
      
   Initially I just replaced the resistors, which worked fine, but I later   
   found timperi's replacement PCB that uses a modern switching regulator:   
     https://github.com/timperi/c64-wedge-psu-pcb   
   I've built a couple of these now (using boards from an eBay seller) and   
   they run much cooler than the original.   
      
   Thanks,   
      
   --   
   Adam Sampson                             
      
   --- SoupGate-Win32 v1.05   
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