On 04/24/2012 01:01 PM, email@example.com wrote: > > > I recall measuring under (C64) load. Of course it might not have been enough to utilise full output rating of the PSU but it was still noticeably more than 9V. I also recall that problems when I was supplying 9V (also under the same load). Judging from the circuit inside the C64 that handles the 9V AC, supplying exactly 9V should work fine. If it doesn't for you, maybe one of the 3 large capactors next to the joystick ports of your C64 is near its end. The old powersupplies give you a bit more since they were designed for 220V while in most of Europe the voltage is now 230V (+/-10%). I usually have 235V at the outlet. What you could do though is open your old PSU, throw out the old rectifier, capacitor and disconnect the regulator (78S05, inside the goo around the transformer) and rebuild that part of the PSU: 1) If you can reach the 230V terminals of the transformer, put a small switching powersupply that will give you +5V 2A or so in the now free space. I used article 350 765 from www.pollin.de, fits perfectly. The transformer will now only supply the 9V AC. 2) If you can't reach the 230V terminals due to too much goo, put in a new rectifier (if the old one was 4 x 1N4001) and capacitor and then use a switching regulator for the +5V. Something like http://www.ebay.de/itm/290572036224 comes to mind. Needs to be adjusted to 5.2V so the C64 sees 5V. Removing the bottom of the power supply is a bit of a pain, but can be done with the right tools. If done right, this renovation will leave you with a 'new' power supply that looks unchanged from the outside and gives you a bit more juice for all your expansion port needs. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2012-04-24 15:00:14
Archive generated by hypermail 2.2.0.