This audio-driven relay was published in the July 1977 issue of Radio Electronics magazine. The circuit uses CMOS components, and the relay must be a sensitive type.
This monostable circuit uses one of the two flip-flops available on the CMOS 4098 integrated...
This shield circuit for PC was found in an English documentation from 1996. The current of the...
This sophisticated digital timer was found in a 2002 documentation. Since CMOS integrated circuits are...