|PSU in action - you too can build this!|
After watching the amazing Jan Beta build a c64 PSU from bits, effectively cobbling a 5v PSU and a 9v transformer together, I thought I'd give it a go myself.
The c64 is that iconic 8bit computer we all loved back in the eighties. It has a very odd PSU which delivers both 9v AC and 5v DC to the main board, and pretty much nothing I've seen in the modern world (that isn't specially made) can deliver this Frankenstein requirement.
Enter Jan's lazy method!
WARNING: I do not take responsibility for you electrocuting yourself when you are doing this. Only proceed to do this if you are comfortable and competent at working with mains voltages!!
We won't be measuring the mains voltages so nothing fancy is required, but you need to know the basics of how to use a multimeter properly. And how not to die electrocuting yourself.
My own Lazy Method:
You will need:
- XP Power, 10W AC-DC Converter, 5V dc, Encapsulated (RS Component Stock no.:172-0797)
- PCB mount transformer 9v 25VA 1x9 o/p (RS Components Stock no.:732-0471)
- Red neon Indicator, Lead Wires Termination, 240 V, 6.4mm Mounting Hole Size (RS Components Stock no.:576-608) (optional)
- Terminal connector block (only need 2 pair, 16 is surplus!)
- A suitable project box - I chose this one
- Some spare mains cabling
- A mains cable with a plug attached
- A couple of cable grommits the same size as the cables to stop the cables from slipping and that covers the holes where they come through.
- Epoxy resin (to glue down the components) or hot glue
- A multimeter
- Some heat shrink tubing
- A fuse holder for a standard 1 amp fuse (or lower rating, 0.5 amp would be ok)
- At least a 1 amp fuse
- A red LED (optional)
- A 300 ohm resister (to dissipate the power from the 5v supply to the LED if you are using one)
- An 7 pin DIN adapter and suitable cable - I had an old one from the c64 I bought where the PSU was broken
- Soldering skills (solder, a soldering iron, tough skin for burns)
- A drill and a variety of bits (to put holes in the case)
- RCD socket like this one
- A good multimeter
- Two holes in the "front" of the project box, one for the cable that goes to the computer and one for the LED
- Three holes in the rear, one for the cable, one for the fuse holder and one for the neon lamp
|Fig. 1 - Partially complete!|