This is one of the many 7400 oscillators we have in our circuit bank. It is crystal controlled and must be powered with a voltage of 5 V.
Constant currents from 10 mA to 1 A can supply the load, depending on the selection made by S1. Q1...
In the figure we have two typical configurations of voltage regulators with protection against short...
Found in an old Radio Electronics, this circuit uses current components, used to rectify AC...