Projects › 12 V 5 A Bench Supply
12 V 5 A Bench Supply
In designTest gearPower supplies
Last updated 5 October 2026
Most of the projects here run from 12 V: the VCR139A monitor and its inverters, the 1200B scope box, the magnetic loop controller and the dummy load's control circuit. This supply provides a fixed 12.0 V at 5 A for all of them.
A fanless 12 V 10 A S-120-12 module from stock (or a Mean Well LRS-100-12) does the regulation and protection. A pi filter after it removes the switching ripple, which matters beside CRTs and receivers, and the output floats with a separate earth post.
At a glance
| Output | 12.0 V fixed, 5 A continuous (10 A module) |
|---|---|
| Filter | 1000 µF – 22 µH – 4700 µF pi filter, TVS clamp |
| Outputs | Main posts and two 2 A fused AUX outlets |
| Protection | Adjustable latching trip 0.6–8 A, front-panel V/A meter |
| Status | Design |
Documentation
The full design report, schematics and parts list will be published here once the project has been built, tested and filmed.