This very simple amplifier was found in the Philips Databook of 1990. The circuit is suitable for headphones and other battery powered applications.
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...