Sonic insect repeller

摘要: An electronic sound generator generates a wide range of frequencies which will repel insects from the area where are prevalent, and with production said maintained at power levels tonal qualities offensive to selected but not dangerous or animals humans. The is generated by means unijunction sawtooth oscillator crystal ceramic transducer. employs transistors generate waveform, frequency varied swept over range. In addition, produces high noise its peaks results in broad spectrum being produced ranging about 10 kilohertz up 150 kilohertz.