So I have always wondered how to effectively move away from the C64 PSU and I have recently been turned on to switching 5V regulators as a good way to deal with high voltage drops that would normally get a 7805 blazing hot.
What I am using is a TI PT78ST105 regulator. Not the cheapest thing in the world but its a brilliant piece of kit. I have tested it with 5V 1.5 amp load being fed a 18V DC input voltage and the thing barely gets luke warm. I ran the same test with a 78S05 (the 2 a