Adding USB to A-BFastiron SS-305MP

▤ Summary

It’s almost as if somebody placed it there to be an input for 5V linear voltage converter and then later figured electronics and heatsinking would cost too much and covered the hole. I was tempted to add a smaller 1 µF capacitor to output and maybe even a 100 nF one for decoupling purposes but decided against it. Due to wide variety of cables and outputs USB device might face, all of them already have more than sufficient decoupling and adding more wouldn’t really do anything. Another thing I would consider bare minimum for power supply would be a short-circuit detection but that’s fortunately already a part of voltage regulator. For a few bucks more and some extra soldering, we have a nice 500 mA USB port at the front of the power supply.

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