README.md

RetroBench Power Supply Unit

This project is a versatile bench power supply unit that can provide a range of DC outputs and 9VAC. The GX16-8 connector can power Commodore retrocomputers.

Commodore retrocomputers support

The power supply has been tested with:

• Commodore VIC-20
• Commodore 16
• Commodore 64
• Commodore 128
• Commodore Amiga 500

Bench PSU outputs

Output voltages are:

• 5VCC
• 9VCC
• 12VC
• 9VAC - through GX16-8 connector
• Variable CC output

3d printed parts

STL files can be printed using:

• PLA filament
• 0.1mm layer height
• 15% infill
• 4 walls

Parts needed

• 1x Meanwell RT-65B power supply (link)
• 1x Core transformer 220VAC to 9VAC (link)
• 1x GX16-8 male & female connectors (link)
• 4x red & black banana socket pairs (link
• 1x Precision multiturn 10kOhm potentiometer (link)
• 1x Miniature toggle switch single pole double throw (link)
• 1x IEC 320 power plug socket 2.0mm AC-01-2, Copper Contact (link)
• 3x M430 10A Digital Voltmeter Ammeter (link)
• 1x MP1584EN Adjustable 3A DC-DC step down converter (link)

GX16-8 pinout

Connector pinout (solder side):

Pin	Description
1	GND
2	+5VDC
3	+9VDC
4	+12VDC
5	-12VDC
6	9VAC
7	9VAC
8	Shield ground

Commodore pinouts

Commodore VIC-20

7 Pin DIN connector - solder side

Pin	Description
1	GND
2	GND
3	GND
4	N/C
5	+5VDC
6	9VAC
7	9VAC

Commodore 16

Barrel connector:

• +9VDC, center negative

Commodore 64 & 128

Commodore Amiga 500

Schematics

[WORK IN PROGRESS]