Commodore 64 Power Saver
This project originally conceived by Ray Carlsen
The original Commodore 64 brick power supply can fail with a dead short across the 5V regulator, damaging its chips.
This circuit can be installed internally in a C64 computer which detects an overvolt condition and disconnects the power supply, preventing harm.
Base Component List
- 5v Relay, low power, 2A minimum rating or greater
- 4.7v Zener diode
- 1.5a fast-blow fuse
- 470Ω Resistors (Quantity 2)
- 2.2kΩ Resistor
- 2N3904 or 2N2222 Transistors (Quantity 2)
- 1N914 Diode
Status LEDs can also be added, as show in the schematic. LED resistor values will vary.