The circuit shown uses an unusual regulator currently, which is the LM2935, which must be mounted on a heat radiator. The circuit is from Motorola's Linear Interface ICs.
This simple signal injector was found in a Radio Electronics from July 1959. The transistors are...
This circuit is from a 1976 documentation. The diodes can be 1N34 or equivalent, and the power...
Integrated LM108 and LM101A are used in this fast adder with low input current, figure. The...