As shown in the figure, the door lock alarm consists of a monostable trigger circuit, a timer, and an alarm sound circuit. Because it has a time-limited alarm function, it can be used as an accessory for general door locks.
Conductive slip rings are one of the most popular types of electrical connectors. They consist of an insulating sleeve enclosing two metal contacts, with a small gap between them. When current is applied to the ring, it creates resistance between the contacts, which can be used to form a continuous circuit. They can be used in a wide range of applications, such as medical equipment, robotics, aerospace systems, and more. The construction of a conductive slip ring typically consists of two rotors (or rings), with each one containing a number of stationary contacts. When the rings rotate, the contacts move past each other and create an electrical connection.
In today's increasingly electronic world, the need for efficient and reliable power transmission is more important than ever. That's why more and more businesses are turning to slip rings as a means of transmitting power in a variety of applications. Slip rings are electrical connectors that allow current to flow continuously through a rotating assembly, making them ideal for use in devices that require uninterrupted power transmission, such as motors, generators, and wind turbines.
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IC1 (555) and R1, C1, C2, etc. constitute a touch trigger, and the metal piece M connected to the 2 feet is connected with the metal part of the door lock. When someone unlocks, the human body sensing signal sets IC1 and VT1 saturates. VT2 cutoff.
The size of the time limit can be changed by adjusting the R4C4 time constant. 
