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Parallel Switch Sounding Device Loop Alarm Circuit

2015-09-24 06:29  
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An alarm circuit having a plurality of audible sounding devices is arranged in series relative to a supervisory current in one direction of flow to enable supervision of the coils of the devices. The circuit is arranged in parallel in the other direction of flow via polarized devices to enable sounding of the devices in parallel.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 noninterrupting type.Loop Alarm technology is an essential part of modern retailing to enable the secure display of demonstration stock, particularly in the electronics vertical. 
Parallel Loop Alarm Circuit