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Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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This generator can be used in grain stores, basements, sheds and other areas where small rodents (mice, rats, hamsters, etc.) are uninvited guests. The diagram of the device is shown in the figure. It consists of a low frequency modulator (DD1.1. DD1.2, C1, C2, R1), an ultrasonic frequency oscillator (DD1.3, DD1.4, C4, R3. R4), a power amplifier based on transistors VT1 - VT3 and sound emitter BA1.
With the values of the elements indicated in the diagram, the generator emits bursts of pulses of 15 ... 40 kHz (regulated by a variable resistor R4) with a repetition rate equal to the frequency of the modulating generator (2 ... 10 Hz, set by a variable resistor R2).
When using the device, it must be borne in mind that the intense radiation of ultrasonic and infrasonic vibrations adversely affects the nervous system of humans and pets. A long stay in a room with a running generator can cause headaches and other discomfort, so it is recommended to turn on the device immediately before leaving the room.
With a long-term operation of the generator with the same frequency ratings, rodents can adapt, therefore, it is necessary to change the radiation parameters 2-3 times a week with variable resistors R2 and R4.
The proposed device can also serve as a signaling device when outsiders enter the room. To do this, the SF1 sensor (one or more) should be installed on doors and windows in such a way that the contacts close in case of unwanted intrusion. In this case, capacitor C4 is also connected in parallel with capacitor C3 - the generation frequency of the second generator is shifted to the region of audio frequencies (1000 ... 2000 Hz) and the sound emitter acts as a siren,
Author: V. Borodai
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