Re: c64 / vic 20 power supply replacement

Re: c64 / vic 20 power supply replacementAh, sorry, and a big Duh!, Don't know what I was thinking. thought the two supplies were connected.

Nice!

m

  ----- Original Message ----- 
  From: Julian Perry 
  To: cbm-hackers 
  Sent: Friday, October 28, 2016 9:04 PM
  Subject: Re: c64 / vic 20 power supply replacement


  ?Sorry? The article at http://c128.com/comment/539#comment-539 ??

  The article mentions that I replaced the transformer (as the old one may have been damaged) with a multi-tap.  Also explains how it's mounted (with nyloc screws to remove the possibility of them working loose). The transformer features in the photographs in the linked article. It's wired straight through to the 9VAC lines, and the 240V line input is bifurcated and also feeds the 5V switchmode PSU. 

  There are a many more photographs at https://www.flickr.com/photos/callidae/albums/72157630236020048 

  Julian



   

       Obviously; 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 




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


       Message was sent through the cbm-hackers mailing list