Second Parallel Loop Alarm Circuit Diagram

I share with you first Parallel Loop Alarm Circuit Diagram and to day i share with you second Parallel Loop Alarm Circuit Diagram. This circuit is 4 parallel switch circuit.  Four parallel switches are used to monitor four positions. When a closure occurs on any switch, SCR1 triggers, which sounds the alarm. The alarm should be of the non interrupting type.

Second Parallel Loop Alarm Circuit Diagram