This listing is for one Commodore 64 Power Supply that has been refurbished and upgraded.

Right about now you are thinking "What????? How does that work?"

It's well known that these power supplies caused a lot of problems for Commodore users.  These power supplies are blamed from everything like overcurrent issues that fried chips on the board to house fires. So a normal power supply should produce around 5 volts DC and up to 12 volts AC.  Every once in a while the power supply fails due to poor construction or improper use plus being over 40 years old.

Even though this power supply was putting out the right amount of power it was obvious that at some point during its lifespan it experienced an overheat which caused the bottom cover of the case to bulge and separate from the main part of the case. At that point I chose to rebuild this power supply.

I gutted the power supply by removing everything inside the case and I saved the power cables because they were still in perfect condition.  What I found was that when the power supply was put together the potting material was not allowed to cure properly causing the 5 volts DC side to not sit properly in the case.  This is probably why the overheat happened but don't quote me on that.

Anyways, to make this a safer design I installed a new 9 volt transformer and a 5 volt power supply. The 9 volt power supply is putting out 10.41 Volts and the 5 volt power supply is set to 5.1 Volts which are both well within spec.

When compared to the original design this does not heat up nearly as much as the original build.  With the original build you could tell that the power supply was heating up after half an hour but with this build everything stays at room temperature.

I have added a power status light and added a fuse to prevent any overheats or fires. I found this design on YouTube but I made improvements like making sure everything is protected with heat shrink and secured versus leaving the wires loose inside the case.

Pictures are from 2/17/2024 and I tested it for 2 hours using a Commodore 64 Dead test and Diagnostic cartridge with no chip failures. I have already used this power supply multiple times with no problems and it works perfectly. The cool part is that this thing weighs less than two pounds so it's not even half as heavy as the original build.

If you have any questions please don't hesitate to ask.  I have listings for Commodore 64 computer sets so if you want to purchase this power supply to substitute into a set and remove the OEM built power supply let me know first so I can make an adjustment to the order before you pay.

If you place an order before 6 PM your order will ship out on the next business day.

Thank you for checking out my listing!