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.
This story is from the April 2024 edition of Electronics For You.
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This story is from the April 2024 edition of Electronics For You.
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