This two-port monostable of the 4001 was suggested by an article in the April 1988 Radio Electronics magazine. The timings are given by C1 and R1.
This circuit turns on an old cassette recorder when the telephone rings, thus enabling the...
This circuit was found in a Poptronics of the 90's. The circuit limits the load current to 0.6 A....
Incandescent lamps and heaters can be controlled by a low power switch using this circuit. The...