The power requirements of the Whizz80 computer are rather minimal and trivial at the moment. Currently only +5v is required and <100 milliamp is required by the system core (and the majority of the power is going towards LEDs).
This power requirement may increase however as I/O modules are installed.
I'm currently using the below power supply, set at 5 volts and current limited to 200 milliamps, but you can use any power supply as long as it is regulated and provides a clean source.