Power Supply Safety Covers for Astron RS-35A

thingiverse

This is a set of safety covers for an Astron RS-35A power supply unit that I use to power my ham radio equipment, and it's proven to be reliable, quiet, and produces clean electrical output. There is one thing about this power supply design that bothers me - the four exposed transistors on the back. They are isolated from the case and heat-sink, carrying a voltage of around 24V. The main output terminal is also exposed, which should be shielded to prevent any damage. A stray conductor can easily contact these points and short them to ground or carry that voltage (at high current) back to other equipment, which will definitely explode your gear. This happened to me when a USB cable connector made momentary contact with one of the transistors. The connector was burned off within seconds and a nice piece of equipment received $150 worth of damage. Don't let this or worse happen to you - these guards are cheap insurance. The guards attach to the supply using 8x3mm round magnets that I sourced at a local hardware store. They fit perfectly into the holes, secured with a drop of super glue for extra stability. Design files for Autodesk Fusion 360 are included so you can adapt this design to other magnets or another power supply. Please give attribution for any remixes.