Electronic insect trap. Scheme, description

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Electronic insect trap. Encyclopedia of radio electronics and electrical engineering

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

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An electronic insect trap is a fluorescent lamp that serves as a bait for insects. A grid of two thin metal conductors is stretched in front of the lamp, to which a high voltage is applied. To make the trap safe for people, a fishing line net is stretched on the outside of the lamp body.

Electronic insect trap

This trap uses a 20W fluorescent lamp. It is connected to the network through a voltage multiplier assembled on diodes VI - V4 and capacitors C1-C4. This made it possible to do without a starter and a choke - details characteristic of a conventional switching circuit. In addition, even a lamp with burnt out filaments is now suitable for work - the glow of the lamp occurs due to the high voltage between its electrodes.

To obtain a high supply voltage of the metal grid, a converter assembled on a dinistor according to the relaxation oscillator circuit was used. The converter is powered from the mains through a rectifier on diodes V5 - V8. At the moments when the capacitor C5 is charged to the turn-on voltage of the dinistor (in other words, its breakdown voltage), a current pulse flows through the primary winding of the transformer T1, and then the capacitor starts charging again. In just a second, the capacitor will have time to charge and discharge about 1000 times, that is, the pulse frequency is 1 kHz. With the same frequency, pulses appear on the secondary winding, but their voltage reaches 1000 V - this voltage is applied to the metal conductors of the grid.

The step-up transformer is wound on a ferrite core from a horizontal transformer (TVS) of the Record TV. Winding I contains 20 turns of wire PEV-1 0 0,5 mm, winding II - 1300 turns of wire PEV-1 0,1.

Capacitors C1, C2 - type KSO-5; C3, C4 - MBGCH for voltage not lower than 400 V; C5 - MBM for a voltage of 500 V. Resistors R1 and R2 with a power of at least 15 watts. It is convenient to use glassed resistors of the PEV type here, but MLT-2,0 resistors in parallel are also suitable. So, the resistor R1 can be made up of eight resistors connected in parallel with a resistance of 240 ohms, and R2 - from the same number of resistors with a resistance of 12 kOhm.

Diodes D226B can be replaced with other rectifier diodes designed for a reverse voltage of at least 400 V at a current of up to. 200 mA. In the absence of a KN102G dinistor, KN102V or KN102D will do, but this will change the generator pulse frequency (in the first case it will increase, in the second it will decrease), and, in addition, the voltage on the trap grid - it will drop when using the KN102V dinistor and increase with the KN102D dinistor.

Authors: V.Baganov, D.Lazarev, B.Ivanov

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