In the figure we have the way to obtain the Exclusive-OR function with 1 transistor. The circuit is from a 1964 Electronic Design. The transistor can be any general purpose PNP.
Found in a 1990 Electronics Handbook, this circuit causes an LED to flash when the phototransistor receives...
This simple low current source for the bench was found in ancient American documentation. The...
In this circuit, a switch, reed-switch or sensor is used to control a half-wave alternating...