CN202206823U - Sweep-frequency type ultrasonic mosquito dispeller - Google Patents

Abstract

The utility model relates to a sweep-frequency type ultrasonic mosquito dispeller which consists of a power supply DC (direct current), a unijunction transistor oscillation circuit, an ultrasonic signal amplifying circuit and an ultrasonic output circuit, wherein the unijunction transistor oscillation circuit consists of a unijunction transistor VT 1, a potentiometer RP, a resistor R1, a capacitor C1, a resistor R2 and a resistor R 3; and the ultrasonic signal amplifying circuit and the ultrasonic output circuit consist of a capacitor C2, NPN type triode VT2, a resistor R4, a resistor R5, a capacitor C3 and a piezoelectric buzzer film HA. With the utilization of an electronic way, the sweep-frequency type ultrasonic mosquito dispeller simulates the ultrasonic wave transmitted by male mosquitoes, as the sensitive frequencies of the ears of a human body and the mosquitoes have a large difference, the ultrasonic wave in the frequency of 21-23kHz cannot be heard by the human body, the sweep-frequency type ultrasonic mosquito dispeller simulates the sound of the frequencies of male mosquitoes flapping with wings so as to dispel the female mosquitoes from the human body and realizes the mosquito dispelling purpose. As different female mosquitoes are different in responding to the ultrasonic wave frequencies, consequently, the sweep-frequency type ultrasonic mosquito dispeller transmits the ultrasonic wave in the sweep-frequency mode.

Description

Sweep-frequency B ultrasonic mosquito expelling equipment

Technical field

The utility model belongs to the application of electronic technology field, is about a kind of sweep-frequency B ultrasonic mosquito expelling equipment.

Background technology

The mosquito that bites the people mostly is the female mosquitoes of bosom ovum, and male mosquito does not generally sting the people.Because of female mosquitoes needs energy and protein during the ovum of bosom, thus hanker after biting warm-blooded animal more, and it is approaching with male mosquito to be unwilling again.In a single day female mosquitoes feels that male mosquito flutters its wings up and down frequency 21～23kHz of sending hyperacoustic the time (female mosquitoes is very responsive to the sound wave of 21～23kHz scope), and female mosquitoes will be shied away.The utility model utilizes the electronics mode to simulate the ultrasonic that male mosquito sends; Because of the sensitive frequency of people's ear and mosquito differs bigger;, frequency do not hear originally that through imitating the flap sound of frequency of male mosquito alar part, the ultrasonic wave energy that mosquito expelling equipment sends makes the female mosquitoes dare not be near human body so being the ultrasonic people basal part of the ear of 21～23kHz; Drive mating through ultrasonic and cross female mosquitoes, to reach the purpose of avoiding mosquito bite.Reaction has certain otherness to ultrasonic frequency because of different female mosquitoes; So mosquito expelling equipment sends frequency of ultrasonic certain limit is arranged; That is: what send is the sweep-frequency B ultrasonic, rather than is fixed on some frequencies, thereby expelling mosquito has reasonable effect.

It is more stable that the described ultrasonic of the utility model is driven the effect of female mosquito, and nontoxic, harmless, radiationless, and the ultrasonic acoustic intensity of wave is lower than the normal human to be accepted below 45 decibels, and people's ear was not both heard and human body is had no influence.The ultrasonic mosquito expelling equipment is real Green Product, is the articles for use of herbal in summer.

Below specify this sweep-frequency B ultrasonic mosquito expelling equipment related relevant technologies in design, manufacturing process.

The utility model content

Goal of the invention and beneficial effect: the utility model utilizes the electronics mode to simulate the ultrasonic that male mosquito sends; Because of the sensitive frequency of people's ear and mosquito differs bigger;, frequency do not hear originally that through imitating the sound of the frequency that male mosquito alar part flaps, the ultrasonic that mosquito expelling equipment sends makes the female mosquitoes dare not be near human body so being the ultrasonic people basal part of the ear of 21～23kHz; Drive mating through ultrasonic and cross female mosquitoes, to reach the purpose of avoiding mosquito bite.Reaction has certain otherness to ultrasonic frequency because of different female mosquitoes; So mosquito expelling equipment sends frequency of ultrasonic certain limit is arranged; That is: what send is the sweep-frequency B ultrasonic, rather than is fixed on some frequencies, thereby expelling mosquito has reasonable effect.

Technical scheme: sweep-frequency B ultrasonic mosquito expelling equipment, form by power supply DC, unijunction transistor oscillating circuit, ultrasonic signal amplifying circuit and ultrasonic output circuit, it is characterized in that:

Unijunction transistor oscillating circuit: form by unijunction transistor VT1, potentiometer RP, resistance R 1, capacitor C 1 and resistance R 2, resistance R 3; The end of the emitter e connecting resistance R1 of unijunction transistor VT1 and an end of capacitor C 1; The other end connection circuit ground GND of capacitor C 1, the end of another termination potentiometer RP of resistance R 1, the anodal VCC of the other end of potentiometer RP and lever arm connection circuit thereof; The end of the first base stage b1 connecting resistance R2 of unijunction transistor VT1; The anodal VCC of the other end connection circuit of resistance R 2, the end of the second base stage b2 connecting resistance R3 of unijunction transistor VT1, the other end connection circuit ground GND of resistance R 3;

Ultrasonic signal amplifying circuit and ultrasonic output circuit: form by capacitor C 2, NPN type triode VT2, resistance R 4, resistance R 5 and capacitor C 3 and piezoelectricity singing piece HA; The base stage of NPN type triode VT2 connects an end of capacitor C 2 and an end of resistance R 4; The second base stage b2 of the other end order junction transistors VT1 of capacitor C 2; The anodal VCC of the other end connection circuit of resistance R 4, the end of the colelctor electrode connecting resistance R5 of NPN type triode VT2 and an end of capacitor C 3, the anodal VCC of the other end connection circuit of resistance R 5; The end of another termination piezoelectricity singing piece HA of capacitor C 3, the emitter stage connection circuit ground GND of the other end of piezoelectricity singing piece HA and NPN type triode VT2.

Annexation in the composition of other circuit and the circuit between the components and parts

The anodal VCC of the anodal connection circuit of power supply DC, the negative pole of power supply DC links to each other with circuit ground GND.

The circuit working principle: accompanying drawing 1 is to produce the continuous variation ultrasonic mosquito repellent circuit working schematic diagram of frequency 21～23kHz.Unijunction transistor VT1 and resistance R 1, potentiometer RP and capacitor C 1 are formed a supersonic oscillations circuit.To capacitor C 1 charging, when charging peaking voltage, unijunction transistor VT1 opens power supply DC through potentiometer RP, resistance R 1; And through resistance R 3 discharge, when the voltage at capacitor C 1 two ends drops to peak value when following, unijunction transistor VT1 ends; Charging～discharge so repeatedly, circuit produces vibration.Regulator potentiometer RP can change the centre frequency of oscillating circuit.The oscillator signal that produces is coupled to the amplifying circuit that NPN type triode VT2 forms through capacitor C 2, and the signal after the amplification sends ultrasonic by piezoelectric ceramics piezo HA at last by capacitor C 3 outputs.

Description of drawings

Accompanying drawing 1 is the embodiment circuit working schematic diagram that the utility model provides a sweep-frequency B ultrasonic mosquito expelling equipment; The negative pole of power supply DC in the accompanying drawing 1 links to each other with circuit ground GND.

Embodiment

Circuit working schematic diagram and description of drawings according to the mosquito expelling equipment of sweep-frequency B ultrasonic shown in the accompanying drawing 1; And according to the annexation between the components and parts in the described each several part circuit of utility model content, and the components and parts technical parameter described in the embodiment requires to implement to realize the utility model.

The selection of components and parts and technical parameter thereof

VT1 is a unijunction transistor, and model is selected BT33C for use, and unijunction transistor is made up of a PN junction, and 3 electrodes are arranged, and unijunction transistor has 1 emitter e, 2 base stage b1, b2;

VT2 is a NPN type triode, pliotron among the optional 2SC9018 of model etc.;

The resistance of resistance R 1 is 1K Ω; The resistance of resistance R 2 is 100 Ω; The resistance of resistance R 3 is 51 Ω; The resistance of resistance R 4 is 47K Ω; Resistance R 5 resistances are 3.3K Ω; Semifixed resistor RP resistance is 51K Ω;

C1 is an electric capacity of the dacron, capacity 47nF (0.047 μ F); C2 is an electric capacity of the dacron, and capacity is 10nF (0.01 μ F); C3 is an electric capacity of the dacron, and capacity is 100nF (0.1 μ F);

HA is the irony piezoelectricity singing piece, and model is the HTD-27A type, diameter ￠ 27.35mm, and maximum sound intensity is 52dB, the diameter of piezoelectricity singing piece can not be greater than 30mm, otherwise the response of ultrasonic highest frequency will be restricted;

DC is a power supply, and the model of selecting for use is the 6V layer-built battery of 4F22-DC, and the voltage of general power supply is high more, and hyperacoustic power output is big more, but the highest 9V that do not surpass of complete machine operating voltage.

Circuit production main points and circuit debugging

The circuit of sweep-frequency B ultrasonic mosquito expelling equipment is so long as the electronic devices and components performance of using is intact; Annexation according to components and parts shown in the accompanying drawing 1 is welded; And to physics wiring is conscientiously checked and is checked, and install, welding errorless after, circuit need not be debugged can operate as normal.

Circuit debugging and use

Whole elements can be installed on the printed circuit board in the circuit, at last circuit board are fixed in the plastic casing.Piezoelectric ceramic piece HA selects the HTD-27A type for use, can directly with 504 glue it be bonded at the position of sound hole in the casing.

The repelling effect of this mosquito expelling equipment depends primarily on the frequency of oscillation of circuit, should debug potentiometer RP repeatedly, makes the frequency of circuit oscillation interval at 21～23kHz, promptly is the frequency range of disliking most female mosquito.

The power output size of circuit is determining repelling effect, and hyperacoustic power output is big more, and then the mosquito repellent scope is bigger and effective; Otherwise the little then effect of hyperacoustic power output is poor more.

Improve the power output of circuit, can increase the final stage power output, best scheme is to increase the one-level power amplification, or directly 6V is made into the layer-built battery of 9V, also can obviously improve hyperacoustic radiation activity.

Claims (1)

1. a sweep-frequency B ultrasonic mosquito expelling equipment is made up of power supply DC, unijunction transistor oscillating circuit, ultrasonic signal amplifying circuit and ultrasonic output circuit, it is characterized in that:

The unijunction transistor oscillating circuit is made up of unijunction transistor VT1, potentiometer RP, resistance R 1, capacitor C 1 and resistance R 2, resistance R 3; The end of the emitter e connecting resistance R1 of unijunction transistor VT1 and an end of capacitor C 1; The other end connection circuit ground GND of capacitor C 1, the end of another termination potentiometer RP of resistance R 1, the anodal VCC of the other end of potentiometer RP and lever arm connection circuit thereof; The end of the first base stage b1 connecting resistance R2 of unijunction transistor VT1; The anodal VCC of the other end connection circuit of resistance R 2, the end of the second base stage b2 connecting resistance R3 of unijunction transistor VT1, the other end connection circuit ground GND of resistance R 3;

Ultrasonic signal amplifying circuit and ultrasonic output circuit are made up of capacitor C 2, NPN type triode VT2, resistance R 4, resistance R 5 and capacitor C 3 and piezoelectricity singing piece HA; The base stage of NPN type triode VT2 connects an end of capacitor C 2 and an end of resistance R 4; The second base stage b2 of the other end order junction transistors VT1 of capacitor C 2; The anodal VCC of the other end connection circuit of resistance R 4, the end of the colelctor electrode connecting resistance R5 of NPN type triode VT2 and an end of capacitor C 3, the anodal VCC of the other end connection circuit of resistance R 5; The end of another termination piezoelectricity singing piece HA of capacitor C 3, the emitter stage connection circuit ground GND of the other end of piezoelectricity singing piece HA and NPN type triode VT2;

The anodal VCC of the anodal connection circuit of power supply DC, the negative pole of power supply DC links to each other with circuit ground GND.

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