This adapter allows you to replace the original DEC Alphastation 200 PSU with a newer ATX PSU.
| Qt. | Description | Designator | Mouser Part |
|---|---|---|---|
| 1 | Capacitor 2.2uF | C1 | T491C225K035AT |
| 1 | Capacitor 1uF | C2 | T491C105K050AT |
| 1 | SMD LED | D4 | 150080VS75000 |
| 1 | ATX 24pin fem conn | J1 | 87427-2402 |
| 1 | Resistor 330R | R4 | CR0805-FX-3300ELF |
| 1 | Regulator L7905 | U1 | L7905CV |
The adapter is designed to use the old power cables, power switch and external fan. You must desolder them from the old one, being careful not to break the terminals.
the original psu provides power and control for external 12V fan on the chassis via a temperature sensor
The adapter does not include temperature sensor control, so the fan will always be active.
Due to the limited space inside the case you need to find a location for the adapter to ensure proper insulation.
maybe if you shortened the cables you could place it inside the ATX PSU
The original ASTEC model AA 19100 power supply has the following characteristics, buy an ATX PSU capable of delivering this power.
| DC output voltage | Current (max) | Cable colour |
|---|---|---|
| +3.3V | 35A | Orange |
| +12V | 4.6A | Blue |
| +5V | 30A | Red |
| -5V | 0.3A | Gray |
| -12V | 0.3A | Yellow |
Thankyou to all the people who have helped with this project.
- Wiretrap-retro who created the PICO-AT that I used as the base design project
- |D|A|V| for testing the adapter in your DEC Alphastation 200
If you found this my work useful, please consider buying me a cup of coffee if you want:
This work is licensed under a Creative Commons Attribution 4.0 International License. See https://creativecommons.org/licenses/by/4.0/.