An SCR Based Burglar Alarm - Adding Extra Zones

The SCR Burglar Alarm System allows for the addition of multiple extra zones. The primary circuit is designed for typical normally-closed input devices, including magnetic reed contacts, micro switches, foil tape, and passive infrared (PIR) sensors. An additional circuit includes a normally-open trigger suitable for devices such as pressure mats. The green LEDs indicate that the various trigger circuits are functioning properly; all LEDs should be illuminated before activating the alarm. If they are not, the siren will sound immediately upon operating the control switch. This module features four distinct zones, each capable of being triggered by normally-closed devices like magnetic reed contacts, passive infrared detectors, and foil tape. Zone 4 includes an extra input for normally-open devices, such as pressure mats.

The SCR Burglar Alarm System is structured to enhance security through its modular design, allowing for the integration of multiple zones tailored to specific detection needs. The primary circuit caters to a variety of normally-closed input devices, which are essential for consistent and reliable alarm activation. Magnetic reed contacts, micro switches, and foil tape serve as effective intrusion detection mechanisms, while passive infrared sensors monitor movement within the designated area.

The inclusion of an additional circuit for normally-open devices expands the system's versatility. Devices such as pressure mats can be integrated into Zone 4, allowing for detection in areas where traditional normally-closed devices may not be suitable. This feature is particularly useful in securing entry points or sensitive areas where pressure-sensitive detection is required.

The system is equipped with green LEDs that provide immediate visual feedback regarding the status of the trigger circuits. This feature is critical for users to ensure that all zones are operational before arming the alarm. The design stipulates that if any of the trigger circuits are compromised or not functioning, the siren will activate as a precautionary measure when the control switch is engaged. This ensures that users are alerted to potential issues before the system is armed, enhancing overall reliability.

In summary, the SCR Burglar Alarm System is a robust solution for comprehensive security needs, featuring multiple zones with both normally-closed and normally-open device capabilities. Its user-friendly indicators and fail-safe mechanisms contribute to its effectiveness in providing a secure environment.You can add as many extra zones as you like to the SCR 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 pressure 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