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  1. BobK

    Correctly setting PWM signal for continuous rotation servo

    The standard period for hobby servos is 20 mSec or 50 Hz, but it is not typically critical. If you go too long between pulses it will become erratic. Did you read the specs: General specifications Speed @ 6V: 0.14 sec/60°1 Stall torque @ 6V: 15.4 kg.cm Speed @ 4.8V: 0.16 sec/60°2...
  2. BobK

    circuit for pulse generation

    No, you want us to do your project for you. If what you want is help, how about telling us what you have done so far and what problems you are having with your design. Bob
  3. BobK

    circuit for pulse generation

    Do you also copy all of your term papers from the internet? Bob
  4. BobK

    A Newbie Question on PNP Transistors

    Actually, the correct learning is that in order to turn on a PNP transistor, the voltage on the base must be less then voltage on the emitter. Bob
  5. BobK

    A Newbie Question on PNP Transistors

    You seem to be missing the point that voltages are always a difference between two points. The base of a PNP has to be negative with respect to the emitter to turn on. Here the emitter is at 9V and the base connected to 0V through a resistor. Which is the same as saying that the base is...
  6. BobK

    TCP IP project

    Then tell us about them and we can discuss. Bob
  7. BobK

    electronic noise reduction options

    Did you try what I suggested in your other thread? Bob
  8. BobK

    LED circuit for rc car

    But you enough to use the calculator correctly, that is better than most! Bob
  9. BobK

    Question Sensor's Connection

    Since the vibration sensor's output is AC and up to 90V, I think you need something more before connecting it to a micro. How do you expect to use it? Bob
  10. BobK

    LED circuit for rc car

    The resistor does depend on the difference between the voltage of the power supply and the sum of the forward voltages of the string of LEDs. You choose the resistor to drop that many volts at the desired current. But you must have known this already, since you did it correctly in your OP. Bob
  11. BobK

    TCP IP project

    The usual engineering process is think of a problem then determine what is needed for the solution. Not think of a solution then determine what is the problem. Bob
  12. BobK

    How to connect multiple amplifiers

    Then you should be getting 4 Watts into a 8 Ohm speaker. If the speakers are of reasonably efficient, this should be pretty loud (though not ear splitting). Bob
  13. BobK

    LED circuit for rc car

    And different forward voltages in the same string are okay, as long as they add up to a volt or two less than the power supply. Bob
  14. BobK

    circuit for pulse generation

    Reza, Who is asking you to do this project that you have, apparently, no skills to perform? Bob
  15. BobK

    How to connect multiple amplifiers

    And the speaker is connected between the two speaker outputs, right? Bob
  16. BobK

    How to connect multiple amplifiers

    How are you connecting the scope, across the two speaker outputs or from one to ground. If across the two speaker outputs, you should be seeing + and - 8V. Bob
  17. BobK

    How to connect multiple amplifiers

    The clipping point is as loud as it can go without serious distortion. What kind of speakers are you using? Perhaps more efficient speakers would help. Also, when you measure 4V how are you doing that? Is that between the two speaker outputs, or from one to ground? It should be going to...
  18. BobK

    terahertz detector

    Who needs fancy diodes like that? A lump of galena crystal and a safety pin, I say. Bob
  19. BobK

    Analog signal 4-20mA

    And how do you distinguish no signal from 0mA? Bob
  20. BobK

    TDA2030A Headphone Amp Gain too high

    Use a chip that doesn't have the gain limitation. Bob
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