This circuit was found in a Popular Electronics from the 90s. It is based on components still common today and an optical coupler for the triac. The sensor is a thermistor.
A Jacob's ladder is a high voltage effects device in which a spark passes between two V-shaped...
This 1975 circuit for automotive applications replaces the mechanical vibrator found in old cars...
This circuit can be used as shield or to drive powerful loads from low current switches such as...