Radu Motisan writes:
Having a regulated power supply that can output precise voltages in the 0 .. 30Volts interval is a great add-on for any electronics lab. Especially when it’s a high power supply.
For this article, I’m going to show my supply, built from scratch, the design I’ve used (schematics) and a few safety tips.
First thing we need is a high power transformer. I’ve ordered a custom toroidal unit, with a primary for 220V mains, and two secondaries one of 24Volts, 10Amps max and another one of 12V, 0.5Amps max. It’s very heavy it it was quite expensive. I’ve also purchased a rectifier bridge, capable of handling 400V at 35A max.
Variable 0..30V 20A Regulated Power supply using LM317 - [Link]