Case And Bag Anti-theft Alarm: Traditional Chinese Circuit Design Guide
In short: Traditional Chinese Case and bag anti-theft alarm: Circuit Design, Parts List & Workshop Prototype Guide (Alarm Device). This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 3029 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Case and bag anti-theft alarmThis alarm is also placed in your briefcase, wallet, and suitcase to prevent robberies. The suitcases and bags are silent when they are in your hands, but once the suitcases are robbed, a loud alarm sounds, forcing the robbers to discard your suitcases and bags.The secret to this alarm device is a homemade touch switch that attaches to the strap or handle of your suitcase or bag. When your fingers are held on the strap or the handle, the air gap of the touch switch is connected with your fingers, and the alarm will not sound. Once the finger is removed, the alarm is triggered and sounds a loud alarm.Please note when using it: Do not put your ears close to the sound generator, as the sound is extremely loud and can easily damage your eardrums.The circuit diagram of this device is shown in Figure 3. As can be seen from the picture, there are two touch switches, one of which (TP1) is installed on the handle of the box or bag or on the strap, and is the control switch. …
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