Transistor Based Burglar Alarm - Adding Extra Zones

  
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You can add as many extra zones as you like to the Transistor Burglar Alarm System. The first circuit is designed to be used with the usual types of normally-closed input devices such as - magnetic-reed contacts - micro switches - foil tape - and PIRs. The second circuit has an additional normally-open trigger for use with devices such as pressur
Transistor Based Burglar Alarm - Adding Extra Zones - schematic

e mats. The Green LEDs are there to tell you that the various trigger circuits are intact. They should all be lighting - before you set the alarm. Otherwise - the Siren will sound the instant you operate the control switch. This module has four separate zones. Each can be triggered by normally-closed devices such as - magnetic-reed contacts - passive infra-red detectors - foil tape etc. Zone 4 has an additional input for normally-open devices such as pressure-mats.



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