grizz Posted March 10, 2011 Report Share Posted March 10, 2011 I decided to rebuild my C64 PSU instead of building a whole new PSU, and I have two questions that I am hoping someone will know the answer to. 1) Does anyone know a suitable transformer available through mouser or digikey that matches the ones in C64 brick PSU's? 2) Has anybody replaced the 3052P with a 7805? If so, other than the difference between pins, are there any other modifications that I need to make? Thanks, grizz Quote Link to comment Share on other sites More sharing options...
nebula Posted March 10, 2011 Report Share Posted March 10, 2011 For a transformer I'm ordering a Hammond 266M18 tomorrow. It has dual 9V windings. It is available from Digi-Key and from Newark, maybe Mouser. Also, Canadian electronics reseller Electro-Sonic now has an American presence, check their web site at www.e-sonic.com - maybe their price is better. I'll be using one 9V winding directly for the AC, and I'll be using a regulator on the other winding to give 5V. The regulator is LM323K, which works like a 7805, but bigger. Digi-key part # is 497-2976-5-ND. This is not a cheap solution but if all goes according to plan it should provide years of trouble-free service. I still need to buy a suitable heat sink and an enclosure. Quote Link to comment Share on other sites More sharing options...
nebula Posted March 10, 2011 Report Share Posted March 10, 2011 I just re-read your original post. Just wondering: you say you want to rebuild instead of building a whole new PSU ... but once you've replaced the transformer and the regulator, the only thing really left is the enclosure and just a few support parts. Why not simply start fresh? Quote Link to comment Share on other sites More sharing options...
grizz Posted March 11, 2011 Author Report Share Posted March 11, 2011 I just re-read your original post. Just wondering: you say you want to rebuild instead of building a whole new PSU ... but once you've replaced the transformer and the regulator, the only thing really left is the enclosure and just a few support parts. Why not simply start fresh? I figured that replacing parts on the C64 power supply makes sense since everything I need is there... case, cords, etc. after replacing the caps and the blown fuse on the 9vac line it seems to work perfectly. I powered it under a load for about an hour, monitoring both the 5v and 9vac lines and all seems fine. I still have a noise problem that I thought ditching the cheap switching PSU i've been using would fix. Quote Link to comment Share on other sites More sharing options...
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