Multi-Purpose Wire-Loop SECURITY SYSTEM

This multi-purpose security system utilises wire loops to secure items. Wire loops can be employed in various ways for security applications such as luggage security, bike security, bicycle security, room security, and door security.

- SURESH CHANDRA DWIVEDI

A wire loop, when attached to security items and alarm mechanisms, detects and alerts in case of unauthorised attempts to tamper with the wire loop.

Use a thin, flexible, and durable conductive wire to create a loop around the area you want to secure. Install the wire loop around the desired perimeter, whether it be a doorway, window, or any other access point. When a breach is detected (e.g., someone cuts or breaks the wire loop), the alarm system activates.

Circuit and working

The circuit diagram of the multipurpose security system is shown in Fig. 2. It is built around transistor BC327 (T1), melody generator UM66 (IC1), low-power audio amplifier LM386 (IC2), 8-ohm half-watt loudspeaker (LS1), 9V battery or 9V adaptor, and a few other components. Around one metre of flexible wire is used as a sensor, forming a loop to connect the article (such as luggage) to CON1 in the circuit.

The melody signal produced by the UM66 melody generator is weak. To amplify the sound signals, the widely-used audio amplifier LM386 is employed.