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Insects and mice repellent circuit using IC556

Here are the insects and mice repellent circuit. Many people do not like these animals. We have many ways to expel it away.

This project is safer and more convenient than using chemicals. We just turn the switch on only and use Low power consumption (only 0.5 watts).

do not like Insects and mice

It uses a high frequency out of the piezo speaker. And IC-556 is base as oscillator between 22kHz and 56kHz.

How this Circuit works

The working of this circuit is easy because IC1 is IC556 that has working principle resemble with IC555 there. So, the IC-556 has dual oscillator generators within a one IC, but IC555 has single oscillator only.

In Figure 1 is completely circuit of Mouse and insects repellent projects.

The reason that we must use dual oscillator generators because the first section will bring to control voltage at pin 11, which this voltage will control the IC changes from 22 kHz to 56KHz, and this voltage has value is 1/3 to 2/3 of power supply.

When voltage change cause frequency also changes. And this frequency is changed all time because mouse, rat, bug, insects and various animal have the ability to different frequency response. When a frequency is changed in range 22KHZ to 56KHZ, makes we can repel a lot of the type of animals.

The IC1/1 will produce a base frequency by include C1, R1, and R2. Which there are frequencies to controls voltage at pin 11. And then the IC1/2 also serves as produce frequencies as same as it, that include C2, R4, and R5 but there are higher frequencies than IC1/1.

When pin 11 voltage changed since IC1/1 causes frequencies at IC1/2 now produce so changing from 22kHz and 56kHz there. The output will be connected to a piezo speaker which is the special speaker that responsible just higher frequencies only.

How to build this projects.
First search all parts before such as PCB, resistors, capacitors, etc. When finished, then make the as same real PCB layout as Figure 2. Next, to assemble all components as Figure 3.

Figure 2 The PCB layout in real size to use.

Figure 3 The all components layout of this projects.

Which Should solder lower parts before such as resistors,capacitors, piezo, and others parts in sequence. And do not remember all wires to circuit.

The Soldering, should the soldering iron be used size under 30 watts, and should use a lead combination of 60/40, and Should be careful the heat from the soldering iron to the IC directly. Or should use a socket IC.

The piezo speaker is the specialty type speaker. Which high frequency response than plain speakers. If apply with plain speaker will be not get in frequencies as we want, because it responsible frequencies that That the human ear can only hear.

How to testing
When we assemble this projects as finished, then enter the power supply to positive supply and ground. The frequency generator will out of the piezo speaker. Which we can not hear sound, but when place your index finger touch at pin 8 of IC, then remove the piezoelectric and replace with the plain speaker, cause sound out of the speaker indicate this projects works so well.

How to use it.
Just only you put this project at a corner or nook in your home kitchen, or use outside the home. To turn into a switch. Next, we have no rats or cockroaches disturbed for a long time. Until battery power is exhausted.

The components list

Resistors ¼ W + 5%
R1: 62K
R2: 150K
R3: 1.6K
R4: 4.7K
R5: 11K
R6: 1K
Mylar capacitors 50V
C1: 0.005uF (502)
C2: 0.0012uF (122)

D1: 1N4001 50V 1A Diode
IC1: IC556 dual timer IC with socket DIP 8pin.
And other parts.

Battery 9V, LED, Piezo speaker, etc.

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This Post Has 17 Comments

  1. The wattage for the speaker is how much?
    shall you help me on that, as the project need!

  2. Hi, Manama
    Thanks for your feedback.

    You can use any size of Piezo speaker. not as normal speaker.

  3. the first output (pin 5) is not connected? is that right?

  4. Sir i am zeeshan from pakistan
    And i am tired for cacraoch please suggest me 100purfect electric devoice in mx home many many cacrroch every day we spray for kill but next morning more offfff

  5. how to bay MOSQUITO REPELLANT by IC-555, CD4017, CD4011

  6. hey designer,
    i just simulated this circuit but cant get any output.
    there is a single alternate of triangular wave-form in beginning after than output goes nil…
    please help me..

  7. Hi Rishabh Gupta,
    I am sorry I cannot test it on simulated program, if it show working please show us to see.

  8. Hello,

    I just built this circuit and its now working good. How long will the battery last? Please make a circuit that is like the taser gun.

    Thank you

  9. This circuit can work also for to repell mosquito or some correction require.What will the voltage at piezoelectric buzzer.

  10. Hi,
    What is the working range of this circuit & how can increase the working range about 20sq meter. Pl. advice.

  11. Pl reply for range increase.

  12. hi there
    i try to make this circuit but it doses’n work i use piezo from my old digital multimeter and mosquito not response why that i dont no
    so plaes help me
    when change to low frequency the sounf appear

  13. Hey designer..
    I just made this circuit but the output of the piezo speaker is very much audible.
    The sound is very sharp and loud but its audible….
    Please guide me…what fault could there be in the circuit?

  14. From where I will get the PCB

  15. Where did I get this Insects and mouse repellent circuit using IC556 kit and what price

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