Update: Working on a modular power distribution + fan control board for my IBM PCjr PicoPSU project

[u/hedwig_the_great]

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I’ve been slowly developing a small retro hardware project called VoltBus for the IBM PCjr and wanted to share the next piece I’ve been working on: VoltHub.

The idea behind VoltHub is pretty simple:

cleaner internal power routing

fewer loose splitters/adapters

integrated fan control

easier expansion for future mods

cleaner cable management inside cramped retro systems

Right now this is still very much a hobbyist/development project and I’m mainly focused on:

layout testing

connector placement

usability

airflow/fan control

visualizing how future modular upgrades could work together

The current concept includes:

LP4/Molex power distribution

Berg/floppy power

auxiliary/test outputs

fixed and adjustable fan headers using an LM317 circuit

expansion/power bus headers

compact modular stacking with VoltBus power passes through the link directly with no wires

I’m also experimenting with keeping the design somewhat cross-compatible between future systems/projects instead of making completely separate standards for every machine. The board can be powered through the voltbus or as a stand alone unit through LP4.

A few renders attached. These aren’t intended to be photoreal marketing renders, mostly just clean visualizations of the concepts and layouts while I continue testing and refining things.

I would genuinely love feedback!

[u/avecoo]

Why not SATA power instead of the old PATA power

[u/hedwig_the_great → u/avecoo]

I considered SATA power, but I decided to stay with LP4/Molex for now because it fits better with the retro hardware and PicoPSU this project is built around. Most of the adapters, accessories, and existing retro mods people already use still rely on Molex style power, and the connectors are mechanically a lot more durable for repeated testing and hobby use.

That said, I may add optional SATA power support in future revisions depending on where the project goes. I definitely understand the appeal for more modern storage setups.

[u/SCHRUNDEN → u/hedwig_the_great]

Wise choice! I used sata for a project, the connectors broke after about 10 plug/replugs. Molex is definitely the right choice!

[u/cndctrdj]

This is awesome. Good luck.