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C64 PSU for the Kradex Z66 case
The Kradex Z66 case is a pretty unexpensive plastic case for a PSU. I think, some of the C64 PSUs on ebay are packaged in the Z66.



Two variants of the PSU in the Z66 case

The PSU can be assembled with different options.
● Transformer TR1: Block VC16/1/9 for 1.8@9VAC
● or Transformer TR2: Breve Tufvassons TEZ10/D230/9V for 1.1A@9VAC
● AC/DC converter M1: Mean Well IRM-20-5 for 4A@5VDC
● AC/DC converter 21: Mean Well MPM-10-5 for 2A@5VDC

I would recommend to use TEZ10/D230/9V and IRM-20-5. The transformer should not be rated much higher than 1A, because a higher rated transformer will have less voltage drop at the C64 load. This higher voltage is not required and which will only heat up the linear regulators. This is usually not a problem, but there are 5 Pin C64 (ASSY 326298) that do not have a heat sink on the 5V linear regulater. This regulator might get slightly too hot. which results in a bad image quality.

The 4A@5VDC are suitable to power a C64 and a Pi1541 at the same time. For this purpose, there are an additional 5V Connector on the PCB.



The PSU powering a C64 and a Pi1541 (which is pretty power hungry and a bit picky with PSUs)


The PSU powering a C64 and a retroTINK (HDMI converter) with the MPM-10-5 (2A) AC/DC


This project is not yet released on Github. It is undergoing a revision. Rev. 1 provides an additional fastOn connector providing neutral (N) for an illuminated mains switch.


Board layout of Rev. 1

Like in my other PSUs, there is a 1MOhm||10nF RC combination between PE and GND (secondary ground) which is well worth its money. It ties both potentials together, which will prevent the "cheap power supply flickering" that might be introduces by a power supply for another component in the setup, like the mobile phone charger, that can be used for the retroTINK.