This 5 V power supply for TTL, Shields and microcontrollers is old, and the components can be replaced by modern equivalents. Transistor Q1 can be a TIP31 and Q2 can be a BD135.
This circuit was found in an English magazine from 1978, but it is still current, just change the...
This is the circuit of a small commercial amplifier from the 1970s from Philips Argentina. The...
This circuit is from a 1965 General Electric hobby manual. The circuit can be assembled with...