This circuit is from a 1992 publication and is based on CMOS technology. The circuit is powered by a 6 V source and the displays are of common cathode.
This circuit can be used in alarms by activating a relay or a current load that depends on the...
This circuit is from the 1968 ARLL documentation. The MOSFET admits equivalent and the coil...
Figure bellow shows how one of the two separated counters found inside the 4518 is used as a...