https://github.com/hkzlab/atxm5v

Inline ATX -5v injector
https://github.com/hkzlab/atxm5v

adapter atx powersupply retrocomputing

Last synced: 4 months ago
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Inline ATX -5v injector

• Host: GitHub
• URL: https://github.com/hkzlab/atxm5v
• Owner: hkzlab
• Created: 2021-10-25T11:35:26.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2021-11-09T06:47:21.000Z (over 4 years ago)
• Last Synced: 2025-08-11T09:33:01.011Z (10 months ago)
• Topics: adapter, atx, powersupply, retrocomputing
• Homepage:
• Size: 349 KB
• Stars: 8
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# ATX -5V inline injector

## Introduction

I needed a quick and cheap way to get -5V available on a modern ATX PSU. The current requirements were risible, so I just made an inline module that takes -12V and regulates down to -5V using a simple and cheap 7905.

![Rev. 1.0 PCB](pics/ATXm5v.jpg)

### Disclaimer

I take NO responsibility for what happens if you decide to build and use this device. Your computer might crash, catch fire or be destroyed in other nasty ways.

## Bill of Materials

| Component         | Qty | Type / Value          |

| ----------------- | --- | --------------------- |

| J1                |  1  | Molex 39-30-1200      |

| J2                |  1  | Molex 172708-0020     |

| Pins for J2       |  20 | Molex 172718-1111     |

| U1                |  1  | 7905 (TO-263)         |

| C1                |  1  | 10uF/16v 1206 ceramic |

| C2                |  1  | 100nF 1206 ceramic    |

### Notes

Cut away the excess plastic from the Molex 172708-0020, fit in all the pins, and then slide the PCB between them. Then solder them, making sure they don't touch.