This is the voltage regulator for my digital formats music player project. There's a bit of tidying up to do and I also need to find a different shaped heatsink but for the most part it is complete.
It takes ~14...40V input, in my case 20V from a laptop brick and turns it into 12V, 5V and 3.3V, theoretically up to 5A on each rail.
3.3V and 5V I had no problems with, 3...4A load and no issues whatsoever, the little inductors got a bit hot at that point but rails remained stable... but on 12V bam voltage loss. And eventually I made my own inductor, giant core that is hard to saturate and thick multistranded litz wire with finetuned inductance to get stable output even at higher loads. I'm pretty proud lol.
The chips used are LM2679, pretty neat stuff !
Couple hours later I return and the thing still works, the heatsink is much warmer but overall great results !