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nabhatti

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Posts posted by nabhatti

  2. Additional Information

    in Projects Q/A

    Posted

    thank you very much sir
    i did made the project work and its doing whatever its supposed to do , moving the LED's along with the music.
    just one question . for the extended circuit, we have transistors that make up a 10 mA current source. how is that 10mA helping us in lighting the strips.
    once again i thank you from myside and from my team members for helping us.
    thank you

  3. Additional Information

    in Projects Q/A

    Posted

    Hello audioguru,

    I am naveed's team partner. Thank you for helping us with
    the dancing LEDS.

    We are at a point where, we really need to get some
    specific information related to this circuit(Dancing LEDS).
    Some thoughts i had for the specification are:


    1)what can we predict about the capacitors in this

    circuit.Like how much time will it take to charge up and

    how long to discharge during the circuit operation.

    2)what will be the error percentage for the amplifing

    factor

    3)what can we tell about the signal characteristic after it

    passes through the first opamp, capacitor, second op-amp,

    diode,right before the clock input and at the counter

    output respectivly compared to the input signal.
    For example:what percentage will be the amplitude of the

    signal right before it enters the counter, compare to the

    input of the circuit.

    the above details i am hoping to use as the specification

    for the circuit. I will appreciate if you can help us with

    the above specification or if you can give some other

    specification for this circuit with better behaviors, that

    we can test out.

    one more question: i was curious why we have that capacitor

    c5 in  parallel to the battery B1.

    thanks once again!!!

  4. Additional Information

    in Projects Q/A

    Posted

    in the project fading LED's under motor, light and power control, R5 is it a 2 Mohm resistor or 22 Mohm. also R1 and R2 are 47 K right.
    The values of C1 and C2 , are they nano farod or micro farad.
    the units are not clearly shown.
    that is why i am asking you
    thank you

  10. Additional Information

    in Projects Q/A

    Posted

    i builded the circuit and everything but when i tested it, i didnt work. no matter how high the volume is ( or low) the LED's wont move. also i changed the distance of the microphone from the radio but still same results. i then tested the circuit with a square wave having 0.1 [v] ampliude and then the LED's start moving 1 by 1 whenever the wave goes from low amplitude to high amplitude. could you please let me know what is going wrong.
    thank you

  12. Additional Information

    in Projects Q/A

    Posted

    i just have a few things to clearify.
    the gain mentioned in the project ( dancing led's ) is 100.  i am assuming the gain mentioned is the maximum gain.
    and also is it a voltage gain or a signal gain ?
    im assuming its a voltage gain
    thank you

  14. Additional Information

    in Projects Q/A

    Posted

    since im using this circuit inside an electronics lab, im going to use 741 op amp powerig it up with 15 volts and powering the counter with 9 v . i also tested my circuit in pspice and it amplified the input signal 100 times at the output. now i tested the circuit again by removing R1 , R2 and C5 and i still got 100 times amplification . so whats the main purpose of R1 , R2 and C5
    thank you

  16. Additional Information

    in Projects Q/A

    Posted

    i was looking at the circuit last night and i have a few questions for you

    as far as i understand, IC1A takes as input music or speech signal and amplifies it 100 times. i understand that the output of the op amp is synchronous with the input, that is for a certain frequency , whatever the voltage is at the input, the output will have 100 times that voltae. now my question is that after amplifying the signal, what does the decade counter does. does it light up each LED for a certain frequency or for every frequency all the LED's light up.
    please provide any kind of help possible.
    thank you

  19. Additional Information

    in Projects Q/A

    Posted

    thank you very much for your reply
    i have one more quick question
    if i need to use another op amp, which needs both negative and positive voltage to power it up , can i do that
    for example 741 op amp
    if i have more questions i will ask you

    thank you

  20. Additional Information

    in Projects Q/A

    Posted

    thank you very much for your reply.
    i was looking at the dancing leds topic in the section of motor, light and power control. in the schematic, i can see that IC1B is being powered up by B1 by connecting it to pin #8 but also pin # 4 is grounded. as far as i understand , if one of the powering voltage is + 15 the other one has to be negative of the same value. or is that pin something else other than the powering of amplifier. also IC1A is not being powered up at all.
    one more thing. could you please explain little bit at what point the circuit is doing what .

    thank you

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