The time of this timer depends on C1. The circuit was found in the July 1994 Electronics Now magazine. The supply voltage depends on the relay and can go up to 12 V.
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...