Commodore 64 Power Supply

thingiverse

I enjoy retrocomputing and keeping them alive, and as any fan knows, Commodore's vintage C64 power supplies are... extremely dangerous to the computer these days, to put it mildly. They fail from age (Hey, they're often over 30 years old - the machine was released in 1982!) and heat in a way that allows them to overvolt the machine, killing hard-to-find vintage parts in the process. Additionally, the machine has somewhat odd supply requirements at 5V DC _and_ 9V AC. While there are a few people making supplies for sale, it really isn't all that hard to source the parts to make one.. except for making it look nice in a box. This case is sized and has screw holes set up to hold this specific set of parts, but could be adjusted for other variations. Frankly, using heat-set threaded inserts would have been a better idea than socketed M3 nuts, but I didn't have any inserts and it shouldn't be all that hard to change the design out for those. Parts required: * 5V DC: Meanwell RS-15-5 ( https://www.ebay.com/sch/i.html?_nkw=Mean+Well+RS-15-5 ) * 9V AC: Jameco Valuepro TR4820-91-R ( https://www.amazon.com/gp/product/B00B886AKC/ ) * Generic Fused C14 inlet ( https://www.amazon.com/dp/B07CTC5JVV ) * 7-Pin DIN Male plug * 4-connector wire with an OD of about 4.2-4.5mm. (Sorry, I used scrap I had lying around; I don't actually have a spec for this) * Lots of M3 nuts and screws. The parts as chosen provide 3A on the 5v line, and 1A on the 9v line, which should be enough to run just about any C64 setup. Interestingly, while I'm in the USA, all the parts here are 230v compatible so the same design should be usable anywhere - as long as you change pairs of input wires on the AC transformer. The Meanwell supply handles the change automatically, but the transformer doesn't. For USA users, you'd want to use the Black and White (center tap) wires. For 220V, you'd want to use Black and Red. Always check your outputs with a multimeter first, though. I used standard spade terminals to connect all the switch/socket tabs together in mine. Connector reference - note that the pinout here is looking at the SOCKET - adjust accordingly when wiring your plug: https://www.c64-wiki.com/wiki/Power_Supply_Connector I've included the FreeCAD file here so it's easier to modify and remix, if needed. I make no claims on how well the design is structured... I'm still learning the application.