A circuit with many applications. It can be used in alarm systems, in immobilizers or any circuit that needs a latch operated by a push button. The circuit is designed around the very common CMOS4013 dual D-type flip-flop IC.
EFK 12000 Just Whistle
EFK 12001 Infra -Red Link
EFK 12002 Infra -Red Remote Control
EFK 12004 Telephone Line Recording Switch
EFK 12005 Sound-Activated Switch