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Ultrasonic Transmitter And Receiver

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    First published on: 1-1-2012



    Most ultrasonic transmitters and receivers are built around timer IC 555 or complementary metal-oxide semiconductor (CMOS) devices. These devices are preset-controlled variable oscillators. The preset value of the working frequency is likely to drift due to mechanical vibrations or variations in temperature. This drift in frequency affects the range of transmission from the ultrasonic transducer.

    The ultrasonic transmitter and receiver circuits described here use CD4017 decade counter ICs.

    The transmitter circuit (Fig.1) is built around two CD4017 decade counter ICs (IC1 and IC2), D-type flip-flop IC CD4013 (IC3) and a few discrete components. The arrangement generates stable 40kHz signals, which are transmitted by transducer TX.

    Fig.1: Transmitter circuit

    The crystal-controlled radio-frequency (RF) oscillator built around  transistor T 1 (BC549) generates an 8MHz signal, which serves as input to the first decade counter built around IC1. The decade counter divides the oscillator frequency to 800 kHz. The output of IC1 is fed to the second CD4017 decade counter (IC2), which further divides the frequency to 80 kHz.

    The flip-flop (IC3) divides 80kHz signal by 2 to give 40kHz signal, which is transmitted by ultrasonic transducer TX.

    Coil L is made with 36SWG enamelled copper wire that is wound 15 times around an 8mm-diameter plastic former as used for radio oscillators, which has a ferrite bead.

    The transmitter circuit works off 9-12V DC.

    The receiver circuit (Fig.2) is built around a single decade counter CD4017 (IC4) and a few discrete components. To check the working of the transmitter, it is necessary to down-convert the 40kHz signal into 4kHz to bring it in the audible range. By using the receiver, the 40kHz ultrasonic transmitter can be tested quickly. The receiver’s transducer unit (RX) is kept near the ultrasonic transmitter under test. It detects the transmitted 40kHz signal, which is amplified by the amplifier built around transistor BC549 (T2). The amplified signal is fed to decade counter IC4, which divides the frequency to 4 kHz. Transistor T3 (SL100) amplifies the 4kHz signal to drive the speaker.

    Fig.2: Receiver circuit

    Use a 9V PP3 battery to power the receiver circuit.

    House the transmitter and receiver circuits in separate small cabinets. If the 40kHz transducer under test is working, the receiver circuit produces audible whistling sound.


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    commentPost Comment | 24 Comments

    jony   1318 days ago

    please provide the project report of this also.
    commentReply   1 Reply
    Pradeep Bhutada   184 days ago

    For study purpose
    sumit kumar   1308 days ago

    please provide the pcb layout for the ultrasonic receiver immediatly please.
    sourabh   1299 days ago

    who we can made L 36 SWG COPPER WIRE PLZ REPLY FAST
    charles nwabude   1293 days ago

    please am interest in this circuit i will to use it as my end of first semester mini project please send me a copy of the circuit diagram and project write up
    vishnu gp   1290 days ago

    please tell about the range of this transmitter. also help to increase it
    asheerou   1286 days ago

    pls can I have the project report of it ? because I am going to do it as my end of degree project.EFY youre the greatest
    vinod   1267 days ago

    for what appln we used this? can we used for receiving internet freq. rx.
    Nuwan   1263 days ago

    I think u can use MCU to This projectAnd i think Its very easy more than Analog ElectroncisUltrasonic modular also u can buy a bout $15 ..its work 1cm upto 3meters Any way Good LuckNice Web Site
    Palash Trivedi   1263 days ago

    Can u plz give more detail about the L that is the inductor used in the circuit......
    piyush   1259 days ago

    plz send the more details of this like the working of each component ...etc circuit on mi email id
    Shashi   1230 days ago

    This cct is realy appriciable. Can u throw some light on its range@what technique are being used for modulation&demodulation.thanks
    silambarasan   1211 days ago

    ultrasonic transmiter & reciver componets & prise plese send me sir
    Kiraa   1207 days ago

    Do we have to make the coil L by ourselves or it is available in market? Will it be risky to make it by own? PLz reply what exactly is plastic former on which this has to be wound? Nice circuits
    Mayank Goyal   1195 days ago

    plz ny1 give itz application.
    shivam awasthi   1188 days ago

    what is the range of this
    Arun   1183 days ago

    where i buy the ultrasonic transmitter and receiver......
    commentReply   1 Reply
    okeh leo   1083 days ago

    where can i by an ultrasonic tx and rx?
    Hassan Almas   1103 days ago

    What is the minimum range for the signal produced from the Tx to the Rx?
    dharani   963 days ago

    pl provide the circuit action
    chandru   929 days ago

    dear sirmadamI need a information about 40khz ultrasonic transmitterreceiver that is how to check the working 40khz ultrasonic transmitterreceiver so please give answer about this If possible now. Thank you.
    raj   851 days ago

    Sir is the coil compulsary here ? Is there any replacement of it ? what if we neglect it ? if it is vital then please add a description of makin it cause here these are not available readymade
    Augusto   604 days ago

    i need help currently im working in a pulser to ultrasonic signal i have similar circuits for TRANSMITTER and for RECEIVER my problem is that im using a transducer that is able to send and receive the signal by the same via how can measure the received signal?
    Rajesh Patel   284 days ago

    Can have PCB lay out for this project and can we get variable signal out put 0-10VDC instead of speaker output?? means if there is no object between tx and rx it should give 0VDC and if there is object between tx and rx then it should give 10VDC.

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