Found in a Motorola manual from the 1980s, this circuit uses components from the era. The circuit controls lamps from 5 to 48 W from 12 to 14 V.
This commercial circuit is from a Japanese magazine from 1967. It uses germanium transistors, and...
This circuit can be used to drive relays, solenoids, motors and other loads according the...
This circuit is based on the small keychain that responded to the sound of a whistle and were...