With the arrival of summer, enjoy the beautiful weather, being in the yard country house, cottage or in the garden. And even if your site is not surrounded swamps, lakes or waterways, most likely during your holiday there annoying and biting mosquitoes to spoil this idyllic picture.
There are many methods and tools, with which you can easily get rid of from the invasion of mosquitoes. To prevent their penetration into the room at the entrance set paper shredders, electric or ultraviolet rays. Mosquitoes and other insects attracted to the light bulb, pass through electric field and die. Under the net accumulated mass of dead insects, which must be periodically removed.
Using spray sprays or Smoking a spiral, which is very often repel mosquitoes, do not forget that they are not safe for human health. It is worth noting that many of the methods used to cope with insects indoors, but cannot be used effectively on a public the air.
Ultrasonic device for repelling mosquitoes is presented in figure and developed, taking into account the fact that usually only bite the female mosquitoes during the period of breeding. At this time, females tend to avoid males and depart from the territory where the frequency emitted by the males. According to some publications, the frequency emitted by the male mosquitoes, is in the range of 20 to 25 kHz, i.e. in the ultrasonic range, and according to others - in the field from 5 to 7 kHz, these frequencies can hear the human ear.
Based on the foregoing the author has collected a simple device with a circuit shown in the figure.
The scheme is based on the 4047 multivibrator, the operating frequency is set hinged components C1, R1 and P1. The potentiometer P1 allows slightly to adjust the frequency.
Author: B. Brosas