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Electronic Mosquito Repellent CircuitFebruary 28, 2014 By Administrator 3 Comments

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Mosquito repellents like coils, mats, liquid vaporizers, creams are often used at various places. Hthey are prone to be fatal and can cause harm to human beings. For instance, mosquito rcreams and oils can cause adverse aects on the skin like allergic reactions. Coils, mats can

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toxic fumes when heated and cause breathing trouble, whereas liquid vaporizers can also fumes when heated.

For ecient results without any side eects, the most optimum solution is building a simple ecircuit with minimal components which can produce output so as to repel the mosquitoes.words, this article is going to describe a simple mosquito repellent circuit.

Principle Behind Mosquito Repellent Circuit:Human beings can hear sound in the range of 20 Hz to 20 kHz. Sound of any frequency above 2termed as ultrasonic sound. Several animals like cats, dogs, insects, mosquitoes have the febeing able to hear this ultrasonic sound. In mosquitoes, this feature is attributed to the presensory structures in their antennae. Usually ultrasound is transmitted by male mosquitreceived by female mosquitoes. However after breeding, female mosquitoes generally avultrasound and this fact can be used to produce ultrasound in a range similar to that producedmosquitoes and repel away the mosquitoes. The ultrasound produces a stress on the antennamosquitoes and repels them away.

In other words, a simple circuit is designed which can produce ultrasound in the frequency rankHz to 38 kHz, which can scare away mosquitoes.

Mosquito Repellent Circuit Design:The basic idea behind developing the circuit is to use a buzzer to produce ultrasound. The bdriven by an oscillator circuit. Here, we are using a 555 Timer based astable multivibrator cthe oscillator circuit.

Designing the circuit involves designing an astable multivibrator circuit. Generally, frequency osignal produced by a 555 astable multivibrator is given by:

F = 1.44((Ra+Rb*2)*C)

Here Ra is the value of resistor between pin 7 and Vcc, Rb is value of resistor between pins 7 anC is value of capacitor between pin 6 and ground.

Let C = 0.01 microFarad

F = 38 kHz

Let Duty Cycle, D = 60% (It is not possible to get 555 timers to produce signal with 50% duty cycle

This gives,

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Ra = 1.44(2D-1)/(F*C)

And Rb=1.44(1-D)/(F*C)

Substituting values of C, F and D, we get

Ra = 0.758 K Ohms, i.e. 758 Ohms and Rb = 1.52 K Ohms

Thus, we can use a resistor of 760 Ohms and another resistor of 1.5 K. Here a potentiometer oused.

So, these are the components we required

An electrolyte capacitor of 0.01 micro Farad1. A ceramic capacitor of 0.01 micro Farad2. A resistor of 760 Ohms3. Another resistor of 1.5 K4. A 38 kHz piezo buzzer5. A SPST switch6. A 5 V battery7.

Theory Behind the Circuit:A multivibrator is an electronic circuit producing a pulsed output signal. Generally multivibrare classied based on the nature of stability of output.A multivibrator with one stable state is known as monostable multivibrator and is used as agenerator. A multivibrator with no stable state is known as an astable multivibrator and is used as anoscillator.A multivibrator with two stable states is known as a bistable multivibrator and is used as a Trigger.

Here we are mainly concerned about Astable multivibrator. Astable multivibrators do not reqexternal triggering and hence can be used as oscillators. They are realized using transistors, opeampliers or ICs.

Circuit Diagram of Electronic Mosquito RepellentCircuit:

Electronic Mosquito Repellent Circuit Diagram ElectronicsHub.Org

The most common form of Astable multivibrator is 555 Timer IC. It is basically an 8 pin IC following pin description:

Pin1 Ground pin, which is directly connected to the negative terminal of the battery.Pin2- Trigger Pin. It is an active low pin. The timer is triggered when signal at this pin is lessone third of supply voltage. For astable operation this pin is connected directly to pin no.6Pin 3 It is the output pin.Pin 4 It is the reset pin. It is an active low pin. It is usually connected to positive rail of the Pin 5 It is the control pin and is seldom used. For safety purpose, this pin is connected to through a 0.01microFarad ceramic capacitor.Pin 6 It is the threshold pin. The timer output is back to its stable state when voltage at thgreater than or equal to two-third of supply voltage. For astable operation, this pin is shortpin 2 and connected to pin 7 using a resistor.Pin 7 It is the discharge pin and provides the discharge path for the capacitor.

Mosquito Repellent Circuit Operation:Once the switch is closed, the 555 timer gets the power supply. As per the inner circuit, initcapacitor voltage will be zero and hence voltage at threshold and trigger pin will be zerocapacitor charges through resistors Ra and Rb, at a certain point voltage at threshold pin is less capacitor voltage. This causes a change in timer output. The capacitor now starts dischargingresistor Rb, i.e. the discharge pin and continues so until the output voltage is back to the origin

the output signal is an oscillating signal with frequency 38 KHz. The output from thismultivibrator circuit drives a 38 KHz piezo buzzer, producing ultrasound at regular repetitivarying the value of potentiometer, the output frequency can also be varied.

Applications of Mosquito Repellent Circuit:As described, this circuit can be used as a mosquito repellent. By certain modications and chthe value of resistors and capacitor, the circuit can also be used as other insect repellent. Furthalso be used as a simple buzzer alarm circuit.

Mosquito Repellent Circuit Limitations:

It requires a lot of frequency setting.Ultrasound signals travel at an angle of 45 degrees from the source. In case of any obstaclpath, the signals get reected or diverted.It shows eect for lesser mosquito population.

Note: Also read the post Air Flow Detector Circuit

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Commentsn.umamaheshwar rao says:July 11, 2014 at 1:11 amwe want latest mini and major project ideas in ece eld

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Administrator says:July 11, 2014 at 10:26 amOnce visit the following link: http://www.electronicshub.org/ece-projects-ideas/

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shockness says:August 13, 2014 at 4:14 pmthis is a really nice & useful project

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