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Planning of 1 inductive door lock burglar alarm system
The metal part M of the door lock and the NAND gate I, R1, C1, etc. are composed of inductive opening delay circuit, and the delay switch circuit of the non gate III and IV, R3, Q, V, etc., in which the non gate III and IV are connected to a typical monostable circuit. HA is a special speaker for the alarm.
当有人开门锁时，人体从周围空间感应到的杂波信号(首要为50 Hz沟通电信号)，经过门锁钥匙和锁体M传递给二极管VD.整流，使与非门工接成的反相器的输入端取得负脉冲信号，其输出端输出一串正脉冲信号。该脉冲信号经Ⅵ)2阻隔、Rl限流后，缓慢地向Cl充电。假如开锁时刻不到8 s，报警电路没有反响。假如开锁时刻超越8 s，则Cl充电电压大于1/2VD，由与非门Ⅱ接成的反相器翻转，其输出端由本来的高电平变为低电平，等于给单稳态电路输入一个负脉冲。所以，与非门Ⅲ和与非门Ⅳ一起组成的单稳态电路翻转进入暂态，与非门Ⅳ输出负脉冲，晶体三极管V经过限流电阻R5取得适宜偏流而饱满导通(实测管压降≤0.3 V)，报警味，lnJl HA通电作业，反复宣布报警声。经过70 S左右，单稳态电路由暂态翻回稳态，V截止，HA断电主动停止发声。
When a person opens the door lock, the signal of the human body from the surrounding space (the first 50 Hz communication signal) is transmitted to the diode VD. through the lock key and the lock body M, making the input end of the inverter connected to the non gate workers obtain a negative pulse signal and output a series of positive pulse signals at the output end. The pulse signal is blocked by Rl, and the current is limited by the 2, and the charge is slowly charged to Cl. If the lock time is less than 8 s, the alarm circuit will not respond. If the unlocking time exceeds 8 s, the charge voltage of the Cl is greater than 1/2VD, and the inverter is turned over by NAND II. The output end is changed from the original high level to the low level, which is equal to the input of a negative pulse to the monostable circuit. Therefore, the mono stable circuit, which is composed of NAND III and NAND IV, flips into the transient state, and the negative pulse of the non gate IV output, the crystal triode V passes through the current limiting resistance R5 to get the suitable bias current and full conduction (the measured tube pressure drop is less than 0.3 V), the alarm taste, the lnJl HA power operation, and the reverse announcement of the alarm sound. After about 70 S, the monostable circuit is turned back from steady state to steady state, V stops, and the HA stops active to stop the sound.
The flash memory diode VL, Dan Xiangjing gate VT, current limiting resistor and normally closed button SB2 constitute the alarm memory circuit. Once the HA is energized, the VT will try to get the trigger voltage from both ends of the HA and turn it on, enabling the VL to flash. After the alarm has been completed, because of the VT's "self preservation" feature, VL will remain bright until the host presses Se and the 2 reset button to relieve the VL's light. In this way, the owner can go home and judge whether the thief has pried the door lock according to the VL light or not, and adopt corresponding preventive measures.
在感应式门锁防盗报警体系的电路中，vDl除了用刁难人体感应杂波信号的整流外，平常还使用其高反向电阻将与非门I的输入端置于高电平。单稳态电路的暂稳态时刻(即延时报警时刻)由C2和R3数值巨细断定，约为0.7ce×R3.因而，当Q为100弘F、R3为1 MQ时，暂稳态时刻约为70 s.sBl是报警后的复位按钮，首要用于查验报警功能后的立刻停止警报声。R2是Cl的放电电阻。
In the circuit of the inductive door lock burglar alarm system, vDl usually uses its high reverse resistance to put the input terminal of the NAND gate I at the high level in addition to the rectification of the human induced clutter signal. The transient state time of the monostable circuit (the time delay alarm time) is determined by the C2 and R3 numeric size, which is about 0.7ce x R3., and when Q is 100 Hong F and R3 is 1 MQ, the temporary steady state time is about 70 s.sBl is the reset button after the alarm, and the first is used to check the alarm function immediately after the alarm is stopped. R2 is the discharge resistance of Cl.
The completion of 2 inductive door lock burglar alarm
In addition to alarm horn HA, the inductive door lock alarm system consists of a printed circuit board with good components and all batteries in a suitable insulation box. The input end of the I is connected with the metal part of the door lock through a single core shielding line, and it is noted that SBl, SB and VL.HA are connected with the control circuit box through the proper azimuth of the box panel.
When soldering, the soldering iron housing must be well grounded, avoiding the communication induced voltage breakdown of CMOS digital integrated circuits. Proper adjustment of Rl resistance or Cl capacity can change the time of hand contact lock timeout alarm, and properly adjust the R3 resistance or G capacity to change the length of each time of the alarm. Only the quality of the components is ensured, and the alarm system can satisfy the operation.
The inductive door lock anti-theft alarm system selects CL9561 voice chip, which can pick out 4 kinds of alarm sounds: police car sound, fire alarm, rescue car sound, machine gun sound.
感应式门锁防盗报警体系应达到以下目标：当电源电压为6 V时，整机静态耗电电流应该小于0.2以，报警时均匀电流约为80 HA，报警后记忆电路作业时约为4 mA.报警电路具有较高灵敏度，一般人手戴着薄纱手套去触碰门锁，电路应该照旧反响。假如在绝缘密闭电路盒内电源负极上接一根软塑导线，将它的一端就地引至220 V沟通电网处，在前方外面缠绕(不是接通)4~5匝，则灵敏度会明显进步。
The inductive door lock anti-theft alarm system should achieve the following objectives: when the power supply voltage is 6 V, the static electricity consumption current should be less than 0.2, the uniform current of the alarm is about 80 HA. The alarm circuit of the memory circuit after the alarm is about 4 mA. alarm circuit with high sensitivity, and the general hand wears a gauze glove to touch the door lock, the circuit should be used. It should have repercussions. If a soft plastic wire is connected to the negative electrode in an insulated closed circuit box, the one end of it is brought to the 220 V communication grid, and the 4~5 turn is winding (not connected) outside the front, then the sensitivity will improve obviously.
When the alarm system is used, there is no additional condition for opening the lock of the host, which is different from one of the most common advantages of the current door lock alarm system. When the device is used, the alarm circuit box can be fixed on the reverse side of the door, and the alarm horn is used in the proximity to any local fixtures with the double stranded wire, but the sound response is outstanding. Another thing to note is that door locks are necessary to maintain excellent insulation with the earth, otherwise the alarm system will not work properly. Because the inductive door lock burglar alarm system is very economical in electricity consumption, every replacement of a new battery can usually take 1 years.