Found in an American magazine from 1968, this circuit produces pulses free of bounces on its output. The integrated is of DTL logic, no longer used today.
This circuit is from 1989 documentation. The circuit is based on CMOS technology and the displays are...
This circuit was obtained from an American publication from the 80's. We can use a BD136 instead...
Found in Popular Electronics this circuit will trigger a buzzer if the ignition key is removed...