Practical Anti-theft Device: Traditional Chinese Circuit Design Guide

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Anti-theft safeAt present, most safes used by units do not have anti-theft alarm devices. Even if they have anti-theft alarm devices, their functions are simple. After some safes are equipped with alarms, whether the owner of the safe or someone else opens the door, the alarm will sound, and the meaning of the alarm is lost. The reason why safes cannot be universally installed with alarm devices is that the function is too single and the operation is cumbersome and inconvenient. The confidentiality is not good and the anti-vandal ability is poor. A common disadvantage is that the alarm device must have an exposed part. For example, when using an AC power supply, its leads, power switch (concealed, exposed, or password key type) or related connections to the alarm sounding circuit may be damaged by thieves. This will make the alarm device unable to work and create opportunities for thieves.The alarm device of this anti-theft safe is installed inside the safe without any exposed parts, so that thieves cannot destroy the normal operation of the alarm device. In addition, the relevant parts outside the cabinet are equipped with high voltage, making it impossible to steal the entire safe.If a thief wants to steal valuables (such as cash, confidential documents or gold and silver jewelry) in the safe, he must first find the combination lock of the safe, and then turn the door handle to open the door. When the thief starts to turn the password lock, the power of the alarm device is automatically turned on inside the cabinet, but the alarm device does not work immediately to alarm, but is in a waiting state. Since the thief does not know the unlocking code, he needs to make a temporary emergency trial and try to piece it together. In addition, the thief has a guilty conscience. The time it takes to piece together the code will definitely exceed the skilled unlocking time of the safe owner, causing the alarm device to work and sound an alarm. The alarm sound will not stop until the cabinet owner hears the sound and rushes to find the safe. The owner of the safe is familiar with the lock password and moves quickly. Although the alarm device is electrically switched on when unlocking the safe, the alarm device will not alarm because the lock is opened within the specified time. If a thief cannot open the door to steal the contents, but wants to steal the safe elsewhere and then break the lock and steal the valuables inside, an alarm will be issued as soon as the thief moves the safe. At the same time, high voltage will be generated in the corresponding parts of the outside of the cabinet, preventing the thief from touching the cabinet and making it impossible to move it away.This alarm device can be installed on various safes and is reliable and safe. …

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