This circuit is from the 1983 Intersil Databook. The circuit has an A / D converter for display of 4 and a half digits being powered by a voltage of 9 V.
The figure shows how to implement a stage with an emitter follower. The stage has high input...
This circuit for timing small loads was found in a 1964 General Electric documentation....
I found this typical shunt regulator circuit in an Argentine magazine from 1973. The circuit can...