This commercial circuit is from a Japanese magazine from 1967. It uses germanium transistors, and the coil can be made with 80 to 100 turns of fine enameled wire on a ferrite rod.
12 V motors and current up to a few amps can be controlled by this circuit that we found in a 1991...
We found this circuit in an internet documentation. The circuit uses a 1 mA instrument, and the...
Two NAND gates are used in the configuration shown here to perform as a monostable triggered by...