Residential building intelligent alarm system

Car Audio Crystal 3.2*2.5mm 3225 24M (24.000MHZ) 20PF 10PPM 20PPM 30PPM

Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle

The anti-theft alarm system of the residential building can display the floor number of the burglary and the number of rooms on each floor, and sound and light alarms at the same time. Figure (a) is a block diagram of the composition of the system. The sensor of the system adopts pyroelectric infrared detection module, and the power supply adopts AC and DC automatic conversion power supply. Figure (c) is the system's audible alarm circuit, which is designed for this system.
The address matrix control circuit in Figure (a) uses two manual push-button type integrated circuits C304 (see Figure (b)). It has 11-19 inputs and four fine ends A, B, c, and D. Usually, the 11~19 end is grounded to ground potential through the resistor, and the output end ABCD is "0000"; when there is a thief, there will be a box end (can be either end) at a high potential, then the AD will be out There is a binary code (BCD) corresponding to the input. If the 13-terminal is high, the BCD code is "0011", that is, the decimal number is "3". The two C403 are combined with the wiring matrix to form the floor and room number matrix display control board (omitted). Figure (c) is an audible alarm circuit constructed with the A, B, and C outputs of one of the C403s.
When there is a thief, there will be a box at the 11-14 of IC1 (C304) in Figure (c). The BCD code in the IC1 box must be in A, B, and C. A high level, the OR gate circuit composed of D1, D2, D3 makes the VT1 saturate and conducts, and the negative transition pulse of the collector makes the monostable trigger circuit IC3 set to a high level box, which is IC4. Provide a working voltage source.