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.
Using an operational amplifier with FET, this circuit from a 1977 publication can generate...
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We found...
Based on an integrated circuit CA31062 which consists of a photosensor, this circuit was obtained from...