This circuit is used to turn on the headlights when it gets dark. The circuit is from an Electronics Now magazine from October 1998. The power transistor must be equipped with a heatsink.
Found in a 1967 EEE, this circuit oscillates at 20 MHz according to the values of the given...
This circuit is from a 1980s Motorola documentation. The circuit can be made with modern...
This circuit is from Radio Electronics from April 1987. The circuit is powered with voltages that...