Mosquito repeller on a microcircuit. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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With the advent of summer, it is pleasant to enjoy the beautiful weather, being in the courtyard of a country house, in the country house or in the garden. And even if your site is not surrounded by swamps, lakes or water channels, most likely there will be annoying and biting mosquitoes during your vacation to ruin this idyllic picture.
There are many methods and means by which you can easily get rid of the invasion of mosquitoes. To prevent their penetration into the room at the entrance, destroyers are installed with electric current or ultraviolet rays. Mosquitoes and other insects, attracted by the light of the lamp, fly through the electric field and die. Under the net, a mass of dead insects accumulates, which must be periodically removed.
Using spray sprays or smoking spirals, which are very often repelled by mosquitoes, do not forget that they are not safe for human health. It is worth noting that many of these methods can cope with insects indoors, but cannot be effectively used outdoors.
The ultrasonic mosquito repellent device is shown in the figure and designed taking into account the fact that only female mosquitoes usually bite during the breeding season. At this time, females tend to avoid males and fly away from the territory where there are frequencies emitted by males. According to some publications, the frequency emitted by male mosquitoes is in the range from 20 to 25 kHz, i.e. in the ultrasonic range, and according to others - in the region from 5 to 7 kHz, these frequencies can be heard by the human ear.
Based on the foregoing, the author assembled a simple device, the circuit of which is shown in the figure.
The circuit is based on the 4047 multivibrator, the operating frequency is set by the mounted components C1, R1 and P1. Potentiometer P1 allows you to slightly adjust the frequency.
Author: B. Brousas
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