By the UCM-40-T and 74LS00 ultrasonic transmitter circuit consisting of NAND gate b

Circuit consists of an ultrasonic transmitter and T-4 0-16 555 circuit, adjust the potentiometer RP can change the oscillation circuit frequency. 40k 3 feet from the output 555

of azelaic z} oscillating pulse-driven T-4 0-16 work, so that emit ultrasonic signals of 40kHz. Circuit operating voltage of 9V. Operating current 40 ~ 45mA, control distance is more than 8m.

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