This circuit was found in a 1964 Electronic Design. The circuit delays the firing of a load for a time given by RC. The SCR must be in accordance with the controlled load.
Found in a 1968 Electronics World, this circuit uses components from the era. In this circuit, a...
This circuit with the LM3909 can be powered with voltages from 3 to 5 V. We found it in a Popular...
This simple circuit triggers when light strikes the sensor. The relay is of the sensitive type with a...