ultrasonic transmitter circuit

Posted on Feb 6, 2014

The circuit uses a 555 timer IC configured as an astable multivibrator, i. e. , it generates a continuous signal of a set frequency as long as its reset pin (pin 4) is held high. Since the ultrasonic transducer used in this circuit is one designed to vibrate optimally at about 40 kHz, the resistor and capacitor values of the circuit were chosen such

ultrasonic transmitter circuit
Click here to download the full size of the above Circuit.

that the 555 will output a signal whose frequency is about 40 kHz. This 555 output is amplified by Q1, which drives the ultrasonic transducer. The transducer then vibrates at 40 Khz, generating ultrasonic sound waves of that frequency. If paired with a matching ultrasonic receiver, such a simple transmitter can be used as a proximity sensor, such as one that can help a robot avoid running into walls. If used in that manner, the transmitter and receiver transducers must be positioned such that the receiver will only receive echoes of the transmitted signal and not the transmitted signal itself.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Headphone Amplifier
    Security Alarm System (PIC16F877A)
    AC Motor Speed Control circuit
    Ramp generator
    12V Car Battery Charger
    ADum3223 issue (H bridge)
    Put That Light Out
    Use upC1663 broadband amplifier
    555-channel temperature test circuits