Commodore 128 Part 2: Building a Power Supply
961I'm building a DIY C128 power supply. As always, if you are doing this be aware that I'm not at all a professional so you do everything on your own risk. I'm not responsible for your actions!
I found out after shooting this that it's much safer to use a cable with a proper mains earth connection! The Meanwell power supply board has a ground pad on one of the screwholes. I highly recommend using a power cable with an earth connection!
Here's part 1 of this video (Inspecting the C128): https://www.youtube.com/watch?v=WuGBdjPdobE&t=32s
Here's the parts I used (not a real BOM because I had some of the parts in my parts bin and/or got them from eBay sources I can not remember):
- BOPLA (also available as HAMMOND) Case ELEMENT E 440 VL 150 x 80 x 55 https://www.conrad.de/de/bopla-element-e-440-vl-universal-gehaeuse-150-x-80-x-55-kunststoff-hell-grau-dunkel-grau-1-st-522236.html
- (North American Enclosure model Hammond MB158055VL https://octopart.com/mb158055vl-hammond-1761671)
- Fuse Holders 5 x 20 mm 6.3 A 250 V/AC SCI R3-54B https://www.conrad.de/de/sicherungshalter-passend-fuer-feinsicherung-5-x-20-mm-63-a-250-vac-sci-r3-54b-1-st-407530.html
- MEAN WELL EPS-15-5, 5 V-/3 A Switching Power Supply, 5V-/3A, Open-Frame
- HAHN BVEI4811167 Print-Transformer 10VA 230V 9V 1111mA
- 1 pole power switch (choose the one you like!)
- 4x.75mm power cable (used for lamps normally)
- A random power cable I had lying around (pro tip: use one that has the correct plug for your country/region!)
- Grommets and cable ties (pink, please!) for securing the cable in the case
- 5-pin square DIN connector (available here: https://www.soigeneris.com/commodore-128-amiga-500-600-square-din-5-pin-male-connector)
- I used a 0.315A fuse for the primary/mains side and a 3.15A fuse for the secondary/5V side.
Plus: Heat shrink tubing, electrical tape, Hot glue and Epoxy. To refine the "standoffs", I ordered self-adhesive 3mm standoffs from China that haven't arrived yet. I'm going to add them in later. My wall plugs solution works but is not very safe obviously...
Here's the pinout diagram I used: https://drunknretro.blogspot.com/2018/02/commodore-128-to-64-power-supply.html
Another note: A couple of days after shooting the video, I adjusted the PSU for exactly 5V by carefully turning the little screw/pot on the PCB. You should do the same. The ideal voltage for the C128 should be between 4.95V and 5,1V.
The PSU should have at least 2.5A for the 5V and 1A for the 9V.
If you find this video helpful and/or entertaining please like, share, subscribe and/or consider a donation!
TWITTER: https://twitter.com/thejanbeta
PATREON: https://patreon.com/janbeta
WEBSITE: https://www.janbeta.net
TWITCH: https://www.twitch.tv/thejanbeta
Thanks!
#JanBeta