Found in a 90s ARRL Handbook, this circuit is intended for the production of signals in the side bands for transmission in SSB.
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...