In the summer many worst enemies are mosquitoes. Moreover, in contrast to from suburban and forest, urban differ agility and more fearful. To kill this bloodsucker is much more difficult as the diet he night, and he will patiently wait until you fall asleep. Just one mosquito can not give to sleep midnight, periodically reminding of its presence.
For mosquito control, except protective creams, are commercially available thermal the evaporators of a special material, capable for 30 minutes in a closed the room to kill all flying insects. How these methods of protection when frequent the use of harmless to man, time will tell, but they are not cheap 'll take.
On sale you can also find a light trap for mosquito repellent Electronic Insect Killer) Chinese production that does not use chemicals. It is made is quite simple and can be easily manufactured by you. Which will require lamp with blue glow of an output not exceeding 25 watts: to obtain a light blue paint can napolcom any suitable lamp.
The lamp is connected in parallel with the mains voltage doubler, which is it is shown in Fig. 2.8.
Fig. 2.8. The simplest option schemes to obtain high voltage
Capacitors C1 and C2 are charged to the peak value of the mains voltage (Umax=1,414*220=311 In), and resistor R1 limits the current through the diodes in case of a short circuit on output.
On pins 3-4 will be a constant voltage of about 620 In - are connected to them two bare wires with a diameter of 0.3...0.6 mm. These wires run parallel (spacing 4 mm) in a spiral around the light on the distance 10.20 mm from the glass bulb and are attached to the dielectric pillars (Fig. 2.9).
Fig. 2.9 appearance design
The lamp is better to use with an elongated cylinder that will allow you to make design traps more compact with increased working area.
The principle of operation of this device is based on the defeat of falling into the gap between the two wires insects electric discharge, and to lure them into the gap, not difficult to guess, is the lamp.
Lamp-trap is hung closer to the ceiling, where more than probable mosquito, and in the hands of the child in this case this voltage toy" will not fall.
The disadvantage of this device is that its action Komar needs almost touch adjacent wires when flying between them: as the voltage on wires lower than the breakdown for air is about 1,000 To 1 mm clearance (depends on humidity), i.e. for the entire gap of 4 mm is obtained 4 kV.
To make traps more effective, you need to increase the tension on the wires of the lattice. This can be done by means of mains voltage multiplier made by the circuit shown in Fig. 2.10.
Fig. 2.10 Option 4-multiple of the mains voltage multiplier
The output in this case will be about 1200 (four times the mains voltage).
The design of the frame, on which is wound a grid of wires, for convenience manufacturing at home can have a rectangular shape, but if the trap will always be in limbo, no need plastic limiters, eliminating hand contact with under high voltage wires.
Used capacitors should be high voltage, for example, type KU-2 630 V.
Diodes you can use any, permissible reverse voltage of at least 800.1000 In, for example, KDG(D), CDH(D).
To further improve the efficiency of the trap allows an additional increase voltage on the wires of the lattice. Typically this is done using pulse Converter. The distance between the wires in this case you will need to increase to this, which still is not formed between the arc discharge.
Author: Shelestov I. P.