This circuit, which can use the 4011 or 4001, was found in documentation from the 90s. The load depends on the transistor used, and the power supply must be isolated.
The integrated circuit is from the time. This low-power circuit was found in the April 1973 issue...
This small amplifier, close to 1 W, was found in a 1963 documentation. The class B circuit uses...
This source of constant current was obtained in an American documentation of 1973. The transistors can be...