We found this circuit in the July 1994 Radio Electronics magazine. The circuit uses a general-purpose transistor, and the power supply can be up to 12 V depending on the relay.
This circuit is from Ferranti documentation from 1967. The operational is of the time, but the...
This simple circuit can be used in a robot that follows the light directly feeding a small motor....
This circuit makes the simple test of SCRs that have a low maintenance current, with those of the...