This 1967 General Electric circuit makes use of an array of 3 (integrated) transistors for an amplifier stage. The circuit has a 500 mV output.
This interesting low current circuit uses only one diode to obtain a full wave rectified signal....
This resistive sensor was found in a 1969 US documentation. The circuit uses transistors of the...
This circuit uses a sensitive reed relay to control external loads. The time delay is given by the...