The 74F74 is a 14-pin digital integrated circuit in a SOT package. A D-type flip-flop with a two positive edge trigger. The device has two data, clock, set and reset inputs; it also has two true and ...

This simple code lock circuit described here is of an electronic combination lock for daily use. It responds only to the roght sequence of four digits that are keyed in remotely. If a wrong key is ...