| 摘要 |
FIELD: electronic equipment for rodent and sucking insect control. SUBSTANCE: repellent device has ultrasonic frequency generator connected with acoustic emitter, cycle and control voltage formers which are connected one with the other. Control voltage former output is connected to generator input. Acoustic emitter generates stepped or saw-shaped signal of maximum to minimum frequency range in working cycle, which terminates in pause. Signal time lag at predetermined frequency and pauses allow repellent effect and effect of loosing the habit of signal for concrete species of rodent or insect to be created. EFFECT: reduced power consumption due to pauses, provision for light weight and portable device and increased efficiency in repelling rodents and insects. 2 dwg |
