3 A switched regulator (CB8859E)

Found in a 90s Popular Electronics, this circuit provides a current of 3 to 5 A depending on the transistor.

MC1454G Amplifier (CB24236E)
The integrated circuit is from the time. This low-power circuit was found in the April 1973 issue...
Class B Low Power Amplifier (CB19069E)
This small amplifier, close to 1 W, was found in a 1963 documentation. The class B circuit uses...
20 mA Current Source (CB13423E)
This source of constant current was obtained in an American documentation of 1973. The transistors can be...