top of page

Ready.'s Commodore 64/128 heavy duty PSU

The specs:

- can run C128+1541-II or c64+1541-II and several other hardware such as REU, 1541-Ulitmate2, .... all together

- +5V line amperage exceeds 3A (3A garanteed, on the C128 version. 2A for the c64 version)

- +12V line amperage exceeds 1A

- 9VAC line max amperage 1A

- +5V and +12V are overvoltage, overload and shortcircuit protected (PSU self resets after power OFF in case of any event of these)

- overvoltage can be tested with a button by the user to make sure it works

- voltage ripple far below 50mV under all working conditions on 5V and 12V lines

- soft voltage rise/fall at start up/power off without overshoot/undershoot (gentle on electronics)

- fuse protected on the mains side with 500mA T (retarded fuse), which should blow only in case of big failure

- low pass filter and surge protection on the mains side to reject high frequencies and voltage spikes

- transformer with double insulation between primary and secondary circuits (grounding not required)

PSU schematic

This is a draft of the PSU schematic, since I am still improving and fine tuning certain things. In particular my goal is to have the 5V output rated at 5A, so I am updating the schematic right now. Below is the schematic I have been using so far for the 3A version.