AN ULTRANSONIC GENERATOR

摘要

The generator generates random ultrasonic wave of more than 16 KHz to repel the insects. An oscillator (1) whose output frequency is varied by combination of resistor (R) and a capacitor (C) provides pulse to a divider (2) providing sequential high level output voltages. The output voltage is provided to a resistor network in which the dividing voltages are varied by combination of resistors. A voltage to frequency converter (3) the sequential dividing voltage provides corresponding sequential frequencies having maximun (FTH) and minimum (FTL) frequencies to an AND gate. Another oscillating circuit is connected to the AND gate providing random output pulse when both levles are in high state. Then a transmitter generates the random ultrasonic wave by the output pulses.