This is circuit dc regulator power supply 5V at current 5A, I used it for my digital production. The mian part electronics is IC 7805 and Mj2955 tansistor.
You must use the the 9VAC 5A transformer.
Circuit power supply 5V 5A by 7805+Mj2955
PCB Power supply 5V 5A by 7805+Mj2955
Source: 79 Electron circuit