TL;DR: Bring that old C64 back to the future with modern technology

The stock C64 PSU is infamous for damaging/destroying your computer when the PSU fails. The PSU consists of mainly two parts; 1) the iron core transformer which outputs 9V AC 2) the linear regulator board which transforms 9V AC to 5V DC

The second part is the weak link and can cause a too high output voltage. The original construction is ineffective, unreliable and produces quite a lot of heat (nice for warming you feet though). Keep the good part and replace the bad one!

This board is a modern replacement/upgrade with switched and filtered voltage regulation. The need for a so called "saver" is minimized/eliminated and you can keep on using your original Commodore PSU.

The board fits the beige wedge shaped PSU variant (third picture); Part No. 902503-06, Part No. 902503-11 and eventually more. Works with 110/230V and 50/60 Hz transformers.

• Output voltage: 5.05-5.25V +/- 0.05V (5.15V default*)
• Output current: 3A MAX**
• Efficiency: ~90% (original board: <50%)
• Size: 70x50x25mm (WxDxH)
• Built with high quality parts from Texas Instruments, Nichicon, Rubycon and others
• 1x 220 ohm resistor included for power LED option
• 2x Holographic decals included (30mm diameter)

*The voltage is slightly higher than 5.0V to compensate for the voltage drop across the power cable and other components. Commodore used the same technique for the stock board.

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The installation requires: 1) Opening the PSU (more or less force is needed as parts are glued together) 2) Removing the original PCB and installing the the new PCB (soldering)

ALWAYS measure and verify correct output voltage and polarity BEFORE connecting the upgraded PSU to your C64.

The boards are hand-built and tested