Transistor Based Burglar Alarm - Adding Extra Zones

The Transistor Burglar Alarm System allows for the addition of multiple extra zones. The primary circuit is compatible with standard normally-closed input devices, including magnetic reed contacts, micro switches, foil tape, and passive infrared sensors (PIRs). An auxiliary circuit provides an extra normally-open trigger for use with devices like pressure mats. Green LEDs are included to indicate that the various trigger circuits are functioning correctly; all LEDs should be illuminated before activating the alarm. If they are not lit, the siren will sound immediately upon operating the control switch. This module comprises four distinct zones, each capable of being triggered by normally-closed devices such as magnetic reed contacts, passive infrared detectors, and foil tape. Zone 4 features an additional input designed for normally-open devices like pressure mats.

The Transistor Burglar Alarm System is designed for enhanced security through modular expansion, allowing users to incorporate additional zones as needed. Each zone operates independently, permitting flexibility in the arrangement of security devices. The primary circuit supports normally-closed devices, which are commonly used in security applications due to their reliability in maintaining a closed circuit until a breach occurs. This is crucial for ensuring that the alarm system remains active and alert to unauthorized access.

The auxiliary circuit's normally-open input provides versatility by allowing the integration of devices such as pressure mats, which can detect physical presence. This feature is particularly useful for areas where movement detection is essential, such as entryways or sensitive zones.

The inclusion of green LEDs serves a dual purpose: they provide visual confirmation that each trigger circuit is functional and ready for operation. This preemptive check is vital, as it ensures that all zones are operational before the alarm is armed. If any of the LEDs are not illuminated, it indicates a malfunction in the respective zone, prompting immediate troubleshooting to prevent false alarms.

The system's architecture consists of four zones, each designed to accommodate various types of normally-closed devices. This allows for comprehensive coverage of an area, with the flexibility to adapt to different security needs. Zone 4's additional input for normally-open devices enhances the system's capability to integrate diverse sensor types, thus expanding its functionality.

Overall, the Transistor Burglar Alarm System is a robust solution for security applications, providing reliable monitoring and the ability to customize the setup according to specific requirements. The careful design consideration for both normally-closed and normally-open devices ensures a versatile and effective alarm system.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 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. 🔗 External reference