Trap for insects. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Trap for insects. 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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The proposed trap for crawling insects, a design sketch of which is shown in Fig. 1 was not originally "electrified". Its body 1 (approximate dimensions 140x45 mm) is glued with dichloroethane from sheet organic glass or other plastic with a smooth surface. Attracted by the smell of bait 6, insects (the composition of the bait should be chosen as the most attractive for them) move along the inlet channel 2 10 ... 15 mm high in the direction indicated by the arrows and fall into compartment 5 covered with cover 4. Get back along the smooth vertical walls they can no longer separate.

insect trap

Practice has shown that many insects, keeping well on the surface of the descending section of the inlet channel, avoid the sad fate, and if this section is made vertical, they do not enter it at all. In the improved trap, at the end of its inlet channel closest to the bait, three electrodes 7 made of aluminum foil glued to the channel surface were installed with small gaps (less than a millimeter). The extreme electrodes, connected together, are connected to one, and the middle one - to the other pole of the high-voltage pulse generator.

Now the insect crossing the gap between the electrodes is subjected to an electrical impulse, "loses consciousness" for a while and falls into compartment 5. The presence of two gaps increases the likelihood of this event. The pulse generator, assembled according to the one shown in fig. 2 scheme, together with the battery is placed in compartment 3 of the trap.

(click to enlarge)

Elements DD1.1 and DD1.2 form a multivibrator that generates symmetrical rectangular pulses with a frequency of approximately 4 Hz. Differentiated by the C5R5 circuit, the pulses start the single vibrator on the elements DD1.3 and DD1.4. Each output pulse of a single vibrator for 5 ms opens transistors VT1 and VT2. At the moment the transistor VT2 closes, oscillations occur in the L1C7 circuit, and the amplitude of the first (positive) half-cycle exceeds 100 V. This is safe for humans, but enough to "stun" the insect. Diode VD1, which opened in the second (negative) half-cycle, shunts the circuit, stopping the oscillations.

(click to enlarge)

The printed circuit board of the generator (Fig. 3) is made of one-sided foil textolite 1,5 mm thick. All resistors are MLT-0,125, capacitor C1 is oxide K50-35, K50-29 (the latter is installed as shown in Fig. 3 by a dashed line) or their imported counterparts. Capacitor C7 - K78-2, the rest - K10-17B or other ceramic ones. The armored magnetic circuit of the coil L1 is formed by two cups 430 made of M2000NM1-16 ferrite. Its winding contains 1500 turns of wire PEV-1 0,14. Battery GB1 - "Krona", switch S1 of any type. The device consumes current no more than 1 mA.

Author: A.Butskikh, Tomsk

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