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 locks when the sensors are opened. The relay can be 6 or 12 V depending on the power...
This circuit uses an unusual PLL, the 4046 CMOS. We found it in the October 1994 issue of...
This circuit triggers a warning oscillator if you forget the lights on when you leave the car. The...