Electronic mosquito trap. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Consumer electronics. Home, household, hobby

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In the summer, mosquitoes are the worst enemies for many. Moreover, unlike country and forest ones, urban ones are distinguished by agility and are more shy. It is much more difficult to kill such a bloodsucker, since his diet is at night, and he will patiently wait for you to fall asleep. Just one mosquito can keep you awake half the night, periodically reminding you of its presence.

To combat mosquitoes, in addition to protective creams, there are commercially available thermal evaporators of a special substance that can kill all flying insects within 30 minutes indoors. How often these protection methods are harmless to the person himself, time will tell, but they cannot be classified as cheap.

On sale you can also find a Chinese-made lamp-trap for mosquitoes (Electronic Insect Killer), which does not use chemistry. It is made quite simply and can be easily made independently. Why do you need a lamp with a blue glow with a power of not more than 25 W: to get blue light, you can paint any suitable lamp with zaponlak.

The lamp is connected in parallel with a mains voltage doubler, the circuit of which is shown in fig. 2.8.

Rice. 2.8. The simplest version of the circuit for obtaining increased voltage

Capacitors C1 and C2 are charged to the peak value of the mains voltage (Umax=1,414*220=311 V), and resistor R1 limits the current through the diodes in the event of a short circuit at the output.

On contacts 3-4 there will be a constant voltage of about 620 V - two bare wires with a diameter of 0,3 ... 0,6 mm are connected to them. These wires run in parallel (4 mm spacing) in a spiral around the lamp at a distance of 10.20 mm from the glass of the lamp and are attached to dielectric posts (Fig. 2.9).

Rice. 2.9 Appearance of the structure

It is better to use a lamp with an elongated bulb, which will make the design of the trap more compact with an increased working area.

The principle of operation of such a device is based on the defeat of insects falling into the gap between two wires with an electric discharge, and, as you might guess, a lamp serves to lure them into the gap.

The trap lamp is suspended closer to the ceiling, where a meeting with a mosquito is more likely, and in this case such a "high-voltage toy" will not fall into the hands of a child.

The disadvantage of this device is that for its operation, the mosquito must almost touch adjacent wires when flying between them: since the voltage on the wires is lower than the breakdown voltage for air, this is about 1000 V per 1 mm of gap (depending on humidity), i.e. i.e. for the entire gap of 4 mm we get 4 kV.

To make the trap work more efficient, it is necessary to increase the voltage on the grid wires. This can be done using a network voltage multiplier, made according to the circuit shown in Fig. 2.10.

Rice. 2.10 4x mains voltage multiplier option

The output of the device in this case will be about 1200 V (four times the mains voltage).

The design of the frame on which the wire mesh is wound can have a rectangular shape for ease of manufacture at home, and if the trap is always in a suspended state, then there is no need for plastic stops that prevent hands from touching high-voltage wires.

The capacitors used must be high-voltage, for example, type K42U-2 for 630 V.

Any diodes are suitable, with a permissible reverse voltage of at least 800.1000 V, for example, KD258G (D), KD257G (D).

An additional increase in the voltage on the grid wires makes it possible to further increase the efficiency of the trap. Usually a pulse converter is used for this. The distance between the wires in this case will need to be increased to such that an arc discharge is not yet formed between them.

Author: Shelestov I.P.

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