Ultrasonic rat repellent generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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This generator can be used in grain storage and other food storage areas. The generator circuit shown in the figure consists of a low frequency modulator (C1, C2, DD1.1, DD1.2, R1, R2). generator of ultrasonic vibrations (C3, C4, DD1.3, DD1.4, R3, R4), a power amplifier on transistors VT1 ... VT3 and an emitter, which was used as a high-frequency loudspeaker 4GDV-1.
With the ratings indicated on the diagram, the generator emits frequency-modulated oscillations in the range of 15 ... 40 kHz. The generator frequency is controlled by resistor R4, the modulation frequency is controlled by resistor R2 within 2...10 Hz.
It must be borne in mind that the ultrasonic vibrations emitted by this generator can adversely affect the nervous system of humans and pets. Prolonged stay in a room with a running generator can cause headaches, nausea and other discomfort, so it is recommended to turn it on just before leaving the room.
If contact S1 is set in such a way that this contact closes in case of unauthorized entry into the room, the generator can also work as a burglar alarm siren, since it begins to emit frequency-modulated oscillations in the range of 1000 ... 2000 Hz.
It should be borne in mind that during prolonged work in one frequency range, rats can adapt, therefore, it is necessary to change the radiation parameters with resistors R2 and R4 2 ... 3 times a week. You can also apply this technique: connect the capacitor C4 to a piece of wire that creates an additional capacitance that changes with changes in temperature, humidity, wind force (if the wire is brought out), etc. Then the frequency will change according to a random law.
Author: V. Borodai, Zaporozhye; Publication: N. Bolshakov, rf.atnn.ru
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