Low Power Digitally-controlled Dual PSU

It comes a moment for any electronics hobbyist to build a power supply unit. Probably is one of the most useful and basic projects that you can go for. Well… one can easily buy those, but what’s the fun then ?

However, the majority of PSUs available on the market are high-power (high-current) PSUs. With huge transformers (if linear), heavy and big for my limited hobbyist corner, would probably be a future consideration. But my vast amount of projects use a max 0.5 amps for supply, so I needed a compact PSU that could deliver the needed voltage without taking half of my workspace. So I built this:

And here you can watch a ripple measurement with my Fluke 289:

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