Re: c64 / vic 20 power supply replacement

From: Mike Stein <*mhs.stein_at_gmail.com*> Date: Fri, 28 Oct 2016 20:52:57 -0400 Message-ID: <C860D73D5CA3418CA21A327C5F135137@310e2> · mhs.stein_at_gmail.com

Re: c64 / vic 20 power supply replacementObviously; so you still have a separate transformer that's not shown/mentioned in your write-up?

m
  ----- Original Message ----- 
  From: Julian Perry 
  To: cbm-hackers 
  Sent: Friday, October 28, 2016 8:49 PM
  Subject: Re: c64 / vic 20 power supply replacement

  No - the 9V floats. (on the 250407 at least) the bridge rectifier CR4 for the secondary 5V supply (which runs from the 9VAC supply) already has a ground reference, and I didn't think it a good idea to have a second.\

  Julian

       I didn't see much detail about the 9VAC; is one side common with the 5VDC ground?

        m
        ----- Original Message ----- 
        From: Julian Perry
        To: CBM Hackers
        Sent: Friday, October 28, 2016 6:07 PM
        Subject: Re: c64 / vic 20 power supply replacement

        FWIW, I in a short 1 evening project gutted and repopulated a C64 PSU with a modern switchmode supply, and it was an unqualified success.

        A write up of it can be found HERE. 

        Julian
        Message was sent through the cbm-hackers mailing list 

  -- 
  Best regards,
  Julian                            mailto:jp@digitaltapestries.com Message was sent through the cbm-hackers mailing list

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