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  • can i know working of this circuit?

    muralistarshine

    Member

    Updated: Oct 26, 2024
    Views: 757
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  • Kaustubh Katdare

    Administrator • Sep 26, 2009

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  • reachrkata

    Member • Sep 26, 2009

    Ok, here is what i understood -

    1) Circuit with IC1 is an Astable Multivibrator to generate the clock for IC2. The clock frequency is decided by R4+VR1 & C1.

    2) IC2 is a decoder, where we are using only the first 5 bits, and when the 6th bit goes High, the decoder gets reset to start over again.

    3) IC3 circuit is again another Astable multivibrator. The frequency is determined according to which bit is set by IC2, and the respective values of VR2-VR6, R5, R6 and C2. I think the values of VR2-VR6 are chosen such that for each output if the decoder a progressively increasing frequency between 60-80kHz is generated.

    4) IC4 is a D-Flipflop with complimentary output also. It divides the frequency output of IC3 by 2 and we get a 30-40kHz output. The complementary signals drive T1-T2-T3-T4 to give out a varying Ultrasonic sound output.

    I think you can further go into the calculations to find out the exact frequencies yourself.

    -Karthik
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  • muralistarshine

    Member • Sep 28, 2009

    thank u, my doubt is can we generate a clock pulse using CA3130 i am not getting it even i tried using multisim too.. but i couldnt so i replaced ca 3130 by ua741 can we get desired output? hope u got me..😕
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  • reachrkata

    Member • Oct 1, 2009

    The reason why the astable will not get simulated in any circuit simulator (incl PSPICE) is because the astable works on the principle that there is an imbalance in the circuit (like residual voltage in the capacitor), which due to positive feedback can be used to generate the pulsing signal. No circuit simulator will assume such an imbalance by default since it takes ideal start conditions. We need to create an artificial imbalance ourselves.

    If possible in the simulation software, try adding some pre-charge into the capacitor C1 & C2 (like it is already precharged to say 1V before the circuit starts working).

    Or else you can also try adding a small AC source in series to the 12V supply (say 1V p-p 10kHz frequency).

    -Karthik
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  • muralistarshine

    Member • Oct 1, 2009

    i didnt get you? plz do xplain clearly .i have tried it even by using ca3130 practically too but i cant get required clock pulse so i replaced it with ua 741!!!😕 i have got desired cyclic variation but it isnt range of 30-40khz can we get?plz explain😒
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  • reachrkata

    Member • Oct 10, 2009

    Hmm !!!
    Perhaps you should just check the theory behind the circuit in your text books and try out the calculations. Then you may get an idea.

    -Karthik
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