External USB-C PD PSU for Atari ST

External USB-C PD PSU for Atari ST (Short)

Replace the aging, noisy external power brick on your Atari 520ST (short) with a modern, reliable USB-C Power Delivery PSU designed specifically for these vintage machines.

Old external PSUs are one of the most common causes of instability, crashes, floppy errors, and expansion faults in Atari ST computers — especially with SidecarTridge, ACSI2STM, and other add-ons. This unit delivers clean, regulated +5 V, +12 V, and −12 V rails, improving reliability and protecting your hardware without opening the computer. 

Simple to use: just connect a quality USB-C PD charger to the PSU, then plug the supplied DIN cable into your Atari ST.

Key Features

• USB-C Power Delivery powered: use a modern USB-C PD adapter (45 W+ recommended; 15 V/20 V PD profiles required) to generate stable multi-rail power.
• Clean, regulated outputs: +5 V, +12 V, −12 V designed for the ST’s needs.
• Built-in +5 V USB-A output: power compatible peripherals like ACSI2STM or Gotek without stressing the ST’s internal wiring. 
• No internal modifications: keeps the computer untouched — no opening, soldering, or altering original hardware. 
• Plug-and-play external PSU: perfect drop-in replacement for the original Atari ST external power brick.

What’s in the Box

• White resin enclosure, precision manufactured
• SidecarTridge USB-C PD Multi-Rail power board, pre-installed
• 4 × M2 × 8 mm screws
• 1 m high-quality cable harness with:
• JST-VH 3.96 mm 6-pin connector
• 7-pin DIN connector for Atari ST
• Rubber feet, installed for desk stability

Everything ships fully assembled and ready to use — no setup, no tools, no hassle. 

Easy to Use

1. Plug in a compliant USB-C PD charger
2. Connect the PSU to your Atari via the DIN cable
3. Power up and enjoy stable, clean power

Upgrade your classic ST with reliable modern power — because solid rails are the foundation for everything else.