Found in a 1967 Electronics World, this circuit can use any modern equivalent FET. Observe the amplitude of the input and output signals.
In the figure we have a sensor circuit that makes use of common transistors and a photo diode as...
This unusual configuration, but which has already been explored in other articles, uses diodes in the...
This circuit uses a modulated signal from a PLL 567 to operate safely with an infrared emitter. The...