CN201421644Y

CN201421644Y - High-sensitive concealed type electronic contact alarm

Info

Publication number: CN201421644Y
Application number: CN2009200812583U
Authority: CN
Inventors: 陈清尧
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-31
Filing date: 2009-05-31
Publication date: 2010-03-10
Anticipated expiration: 2019-05-31

Abstract

The utility model discloses a high-sensitive concealed type electronic contact alarm. The utility model is characterized in that the alarm comprises a power supply, a high-sensitive monostable contactcircuit and a multivibrator alarm circuit; the power supply is made by connecting overlapped batteries 9V and a switch S in series; the high-sensitive monostable contact circuit consists of a fieldeffect tube VT, a time base circuit IC1, a peripheral resistor R1, a peripheral resistor R3, a potentiometer R2 and a capacitor C1; the multivibrator alarm circuit consists of a time base circuit IC2,a peripheral resistor R4, a peripheral resistor R5, a capacitor C4, a capacitor C5 and a loudspeaker B. The high-sensitive concealed type electronic contact alarm can be installed in places easily coming into contact, such as door locks, windows, handbags, safes, etc. As long as defenceless thefts touch or approach an induction area A, the loudspeaker B immediately makes sound, performing the function of alarming or threatening thefts.

Description

Highly sensitive concealed type touches electronic alarm

Technical field

The utility model relates to electronic alarm, is specifically related to highly sensitive concealed type and touches electronic alarm.

Background technology

At present, the electronic alarm of Xiao Shouing is more on the market, but the ubiquity volume is bigger, installs unhiddenly, and sensitivity is not high, if a lot of alarm is with the gloves touch can lose warning function.

The utility model content

Problem to be solved in the utility model is at above-mentioned technical deficiency, how to provide a kind of highly sensitive concealed type to touch electronic alarm, it is contained in the position that door lock, window, bag or safety cabinet etc. touch easily, the robber is with gloves to touch gently or close induction region A exactly, loudspeaker B just sends alarm sound immediately, plays and reports to the police or deterrence robber effect.

The technical matters that the utility model proposed is to solve like this: construct a kind of highly sensitive concealed type and touch electronic alarm, it is characterized in that: comprise power supply, the monostable touch circuit of high sensitivity and multi-harmonic-oscillations warning circuit; Power supply is composed in series by 9V laminated cell (G) and switch (S); The monostable touch circuit of high sensitivity is made up of field effect transistor (VT), time base circuit (IC1) and peripheral resistor (R1, R3), potentiometer (R2) and capacitor (C1); The multi-harmonic-oscillations warning circuit is made up of time base circuit (IC2) and peripheral resistor (R4, R5), capacitor (C4, C5) and alarm speaker (B).

Touch electronic alarm according to highly sensitive concealed type provided by the utility model, it is characterized in that: the positive pole of power supply 9V laminated cell (G) links to each other through 8 pin of 4 pin, 8 pin and the time base circuit (IC2) of tandem tap (S) and time base circuit (IC1), and negative pole is connected with circuit publicly.

Touch electronic alarm according to highly sensitive concealed type provided by the utility model, it is characterized in that: the drain electrode (D) of monostable touch circuit field effect transistor (VT) is connected with anode after the switch control through resistor (R1), source electrode (S) is connected with 2 pin of time base circuit (IC1), another road is through the public ground of potentiometer (R2) connecting circuit, and the grid (G) of field effect transistor (VT) is connected with induction metal plate (A).

Touch electronic alarm according to highly sensitive concealed type provided by the utility model, it is characterized in that: 3 pin of time base circuit (IC2) link to each other with the positive pole of output coupling capacitor (C5), the negative pole of loudspeaker (B) end and electric capacity (C5) is connected, and the other end is connected with the circuit common.

The beneficial effects of the utility model are: touch electronic alarm at antitheft local this highly sensitive concealed type of installing such as door lock, window, bag or safety cabinet, this alarm is installed on woman style bag especially, anti-theft effect is especially obvious, thereby plays effective protection property safety; It is small and exquisite that the highly sensitive concealed type of this utility model touches electronic alarm, easily hides, and circuit structure is simple, and performance is safe and reliable, power saving and durable in use.

Description of drawings

Accompanying drawing 1 is a circuit structure diagram of the present utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.

As shown in Figure 1, field effect transistor VT, time base circuit IC1 and peripheral Resistor-Capacitor Unit (R1, R2, R3, C1, C2) are formed the monostable touch circuit of high sensitivity, and time base circuit IC2, peripheral Resistor-Capacitor Unit (R4, R5, C3, C4, C5) and loudspeaker B form the multi-harmonic-oscillations warning circuit.When using this highly sensitive concealed type to touch electronic alarm, closed power switch S, circuit is started working, when unmanned contact or close sensing chip A, D, the S electrode resistance of field effect transistor VT are very little, and the 2 pin current potentials of time base circuit IC1 are higher than Vcc/3,4 pin of the then basic IC circuit 2 of 3 pin output low levels of IC1, therefore time base circuit IC2 does not work, and loudspeaker is sounding alarm not; During as people's contact or near sheet metal A, the induced voltage of human body makes D, the S electrode resistance of field effect transistor VT become very big, the 2 pin current potentials of time base circuit IC1 are lower than Vcc/3,4 pin of the then basic IC circuit 2 of 3 pin output positive pulse level of IC1, holding time of this positive pulse level by R3 and C1 decision, this pulse makes time base circuit IC2 starting of oscillation work, the 3 pin outputting oscillation signals of IC2, drive loudspeaker B sounding alarm, its oscillation frequency is determined jointly by R4, R5 and C3.Change the resistance of potentiometer R2, can change the sensitivity of touch or close sense.Have only when this alarm comes into operation, Closing Switch S, cut-off switch S then when not using this alarm can save electric energy in the battery like this.

Component parameter: R1-R5 selects the carbon film resistor of 1/8W for use; Power supply G selects 9V laminated cell commonly used in the microphone for use; VT selects 3DJ6 model field effect transistor for use; C2, C3 and C4 select the 0.1uF/16V monolithic capacitor for use, and C1 and C5 select the 22uF/25V aluminium electrolutic capacitor for use; B selects bore φ 35mm0.25W/8 Ω loudspeaker for use; The area of touch sensible sheet metal A should be greater than 100 square millimeters.

The utility model also can be made various alternatives, more than by embodiment by accompanying drawing 1 illustrated embodiment, be that foregoing of the present utility model is done step detailed description, but this should be interpreted as that the scope of the theme that the utility model is above-mentioned only limits to described example.Do not breaking away under the above-mentioned technological thought situation of the utility model, various replacements and change according to ordinary skill knowledge and customary means are made all should be included in the scope of the present utility model.

Claims

1, a kind of highly sensitive concealed type touches electronic alarm, it is characterized in that: comprise power supply, the monostable touch circuit of high sensitivity and multi-harmonic-oscillations warning circuit; Power supply is composed in series by 9V laminated cell (G) and switch (S); The monostable touch circuit of high sensitivity is made up of field effect transistor (VT), time base circuit (IC1) and peripheral resistor (R1, R3), potentiometer (R2) and capacitor (C1); The multi-harmonic-oscillations warning circuit is made up of time base circuit (IC2) and peripheral resistor (R4, R5), capacitor (C4, C5) and alarm speaker (B).

2, highly sensitive concealed type according to claim 1 touches electronic alarm, it is characterized in that: the positive pole of power supply 9V laminated cell (G) is connected through the switch (S) of series connection and 8 pin of 4 pin, 8 pin and the time base circuit (IC2) of time base circuit (IC1), and negative pole is connected with circuit publicly.

3, highly sensitive concealed type according to claim 1 and 2 touches electronic alarm, it is characterized in that: the drain electrode (D) of monostable touch circuit field effect transistor (VT) is connected with anode after the switch control through resistor (R1), source electrode (S) is connected with 2 pin of time base circuit (IC1), another road is through the public ground of potentiometer (R2) connecting circuit, and the grid (G) of field effect transistor (VT) is connected with induction metal plate (A).

4, highly sensitive concealed type according to claim 1 touches electronic alarm, it is characterized in that: 3 pin of time base circuit (IC2) link to each other with the positive pole of output coupling capacitor (C5), the negative pole of loudspeaker (B) end and electric capacity (C5) is connected, and the other end is connected with the circuit common.