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nabhatti

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  1. could you please explain why do we need C2 in series with resistor R4? how is that capacitor effecting the rest of the circuit? by increasing the value of C4 , will we increase the circuit speed or decrease it
  2. 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. 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. 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
  5. the terminal labeled (+) beside R11 will be connected to the battery right. im talking about the extension circuit.
  6. if you look at the extended circuit, there is a R9 terminal and a terminal at the top with a (+) sign beside it. where will we connect those terminal in the original circuit.
  7. for the extended circuit, can i use 2N3904 NPN transistor instead of BC337 and 2N3906 PNP transistor instead of BC327 thank you
  8. i wish to extend the circuit but can not understand where to connect the terminals of the extented circuit. could you please let me know. once again , my project is Dancing LED's
  9. could you please let me know from where to buy the electret microphone. again, im living in Houston,TX. thank you
  10. 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
  11. in the project (dancing LED's) , C5 is 25V electrolytic capacitor. what does that 25V specify. also , if i use a 100uF 50V electrolytic capacitor instead of 100uF 25V electrolytic capacitor, will that be ok to use. thank you.
  12. 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
  13. im looking at cd4017be for the decade counter. is that going to be good for this project thank you
  14. 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
  15. i went to the website to purchase the op amp but there are so many of them e.g, LM358AM, LM358P etc. which one best suites this project. thank you
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