Found in a Radio Electronics store from the 90s, this circuit is for cars of that era. The circuit uses a 2N3055 that must be equipped with a heat sink.
This source was found in a 1982 American publication, but can be easily assembled using 2N2995 (PNP...
This contact or reed switch actuation was found in a 1964 Electronic Design. The circuit can be...
Found in a 1968 Electronics World, this circuit uses components from the era. In this circuit, a...