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Antitheft circuit

A circuit and electrical signal technology, applied in anti-theft alarms, mechanical vibration actuation of anti-theft alarms, instruments, etc., can solve problems such as long response time, inability to adapt to different working environments, inconvenient adjustment of induction sensitivity, etc., to achieve response The effect of short time, simple structure, and convenient adjustment of sensing sensitivity

Inactive Publication Date: 2017-01-25
成都尚智恒达科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the problems of complex structure, long response time, inconvenient adjustment of induction sensitivity and inability to adapt to different working environments in the intelligent anti-theft circuit

Method used

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Embodiment 1

[0024] Such as figure 2 , The signal conversion unit adopts a single-chip microcomputer, and the model selection is STC89C81.

[0025] A further solution is: the ringing circuit includes chip U1, sliding resistor R15, power supply VCC2, ringing LB, NPN transistor Q3 and NPN transistor Q4, chip U1 uses a 555 timer, and pin 7 of chip U1 is connected to the emitter of NPN transistor Q3 The collector of the NPN transistor Q3 is connected to the power supply VCC2, the base of the NPN transistor Q3 is connected to the pin 39 of the microcontroller, the pin 7 of the chip U1 is also connected to the resistor R16, the other end of the resistor R16 is connected to one end of the sliding resistor R15, and the sliding resistor R15 The other end of the capacitor C9 is connected to the capacitor C9, the other end of the capacitor C9 is grounded, the second branch is drawn between the connection point of the sliding resistor R15 and the capacitor C9 to connect the pin 2 and pin 6 of the chi...

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PUM

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Abstract

The invention discloses an antitheft circuit. The antitheft circuit comprises a sound sensor, an amplification module, a signal comparison module, a signal conversion unit, a ringing circuit and an LED lamp luminous circuit, wherein the sound sensor receives ambient sound variation and converts the ambient sound variation to an electric signal to be transmitted to the amplification module; the amplification module filters and amplifies the electric signal of the sound sensor and then transmits to the signal comparison module; the signal comparison module compares the signal transmitted by the amplification module with a preset value and outputs a level signal; the signal conversion unit receives the level signal and outputs a ringing control signal and an LED lamp control signal; the ringing circuit receives the ringing control signal to realize a ringing function; the LED lamp luminous circuit receives the LED lamp control signal and realizes a function of turning on an LED lamp. The antitheft circuit is simple in structure, short in response time, convenient for adjusting the induction sensitivity and adaptable to different working environments.

Description

technical field [0001] The invention relates to the field of smart home, in particular to an anti-theft circuit. Background technique [0002] With the development of electronic technology, especially the widespread use of single-chip microcomputers in the civilian field and the development of wireless technology, the functions of smart home anti-theft combination devices are becoming more and more powerful, and smart home anti-theft combination devices have almost become the first in every household. An anti-theft option. Almost all voice-activated anti-theft circuits use digital chips in integrated circuits. The cost of digital chips is high, and the program in the chip needs to be modified when adjusting the sound sensitivity, which makes the operation complicated. Contents of the invention [0003] The purpose of the present invention is to solve the problems of complex structure, long response time, inconvenient adjustment of induction sensitivity and inability to ad...

Claims

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Application Information

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IPC IPC(8): G08B13/16
CPCG08B13/1672
Inventor 任无史晓莉
Owner 成都尚智恒达科技有限公司