Found in a 90s EDN, this circuit is indicated for power control through a 4-20 mA line. The circuit makes use of optical couplers of the time.
This circuit is indicated for applications powered by 12 V sources. The battery is 12 V according to...
This circuit was found in a Popular Electronics from April 1993. It is a voltage regulator circuit for...
This modern regenerative receiver was featured in the March 1994 issue of Electronics Now...