Found in the 1991 Electronics Experimenter Handbook, this circuit detects voltage variations in the circuit when the engine starts.
We found this circuit in a Philips documentation from 1969. It makes use of transistors of the...
The circuit shown in the figure generates rectangular signals up to 1 MHz with three types of...
We found this circuit in the 1960 Mullard transistor reference manual. The phototransistor can be a...