In many parts of the world, there are pest problems. Mosquitoes are one of the most widespread and annoying pests, but they can also be highly dangerous. Often, it is necessary to have extra protection elements such as chemical repellents or electronic repellents. In this article, we will look at how making an electronic mosquito repellent that uses sound frequencies to keep these annoying insects away from us.
- 2 resistors of 10k and ¼ watt.
- 2 resistors of 560 Ω of ¼ watt.
- 2 transistors BC547 or failing that 2N3904.
- 1 ceramic capacitor of 82 pF.
- 1 ceramic capacitor of 330 pF.
- 1 power supply (battery) of 1.5 V.
- 1 switch.
- 1 battery holder.
- 1 piezoelectric buzzer.
Making our electronic mosquito repellent
The initial idea is to create a electronic mosquito repellent that we can use in a portable way on any camping trip and, of course, that we can use from the comfort of our own home.
The first step is to create a printed circuit design from a small square board of dimensions 2cm x 2cm. The creation of the circuit is quite simple, we have to make a connection from the power supply, i.e. from the battery holder to the switch and from there we make a line of parallel connections of the resistors. Then, between each pair of resistors we will place a capacitor and make cross connections with the transistors. To complete the circuit, we must connect the buzzer. To better visualise the assembly, we can observe the position of the components on the PCB.
The connections are very simple and to better illustrate the assembly, we can visualise the circuit diagram in the following diagram.
When we have our circuit ready, we only have to place it inside a small wooden or acrylic box. Now, we just need to insert the battery and activate the switch to make our device work.
How it works
This device is capable of creating sound waves that are inaudible to people, as they are above 20000 Hz, but which can scare away mosquitoes and which are also harmless to the environment and domestic animals. In this way, we can have a device that can be used as a mosquito repellent very low energy consumption and very practical.