Like everyone, the power supplies of my good old commodores died a long time ago and the computers stored in the garage with the idea of making them work later...Life being life, that later turned into almost 20 years of storage until one of my 12 years old daughter asked me what in that box.
So i took a few transformer laying around in another junk box and made a terribly crude set of power supply capable of powering up the C64 and a 1541-II, turned the 1702 video cable into a S-VHS cable and hooked everything on the 50 inches tv of the living room... To my surprise, it worked even after being stored for so long in an unheated garage where it baked at +30'c in summer until being cold down to -40'c in february years after years.
Wha was even more surprising is the disk are still readable even after being stored like that too. But i know i have been pushing my luck quite a bit, And i want to restore then to good working oder. So i've decided to build a real power supply for them. And get back to electronic at the same time, since that had been stored in the garage of my mind before the C64 died...
I have started a projetc on Circuit Maker (A free CAD software that combine a lite version of Altium Designer and a collaborative hub) called "CBM Universal Power Supply", and did a first draft of what such power supply could look like.
The goals of the power supply is to:
- Provide 5VDC/4A and 9VAC/3A for the computer.
- Privide 5VDC/3A and 12VDC/3A for other peripherals.
- Can be a single box with both supply combined, or two different module.
- Should cost less than 100$ to build a prototype.
- Look like a design that could have come from CBM (IE, not too fancy, minimum BOM to get things working correctly).
- Be more reliable than what CBM used to pack as power supply.
- Have fuse in it (there are 4 resetable fuses on the PCB).
- Should not take fire (at least not on purpose).
Here's a look of the first draft of the PCB:
So feel free to participate in the design of such a little toy if you feel like it.
And no, i do not plan to sell this. But it's OSH, so if you want to do it, feel free.