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  1. BobK

    Help understanding SNR of a radio reciever

    If you want to build a radio receiver you should leave your guitar and amp out of it. Look for circuits for radio receivers. If you get one that works and produces audio, you can run it through your guitar amp to get louder audio. Bob
  2. BobK

    Help understanding SNR of a radio reciever

    http://en.wikipedia.org/wiki/Regenerative_circuit Bob
  3. BobK

    Knight Rider K.I.T.T. Scanner

    You need a programmer to program standard micros. They can be had for < $50 from Microchip. The PICKit 2 or 3 is an example. It connects to your computer via USB and you then program through tools that are free from Microchip. You can program either in assembly language or C. Another...
  4. BobK

    Knight Rider K.I.T.T. Scanner

    Coca Cola knows more about this type of LED driver, I have never used one. Are you there? Bob
  5. BobK

    Help understanding SNR of a radio reciever

    No, it is multiplying the RF, not the audio. Bob
  6. BobK

    Knight Rider K.I.T.T. Scanner

    The micro cannot connect directly to that many LEDs because the sum of them would require too much current for it to provide. So you need an external chip to turn the LEDs on and off. The Darlington arrays that I mentioned are just 7 transistor switches in a single IC package. You would use...
  7. BobK

    Digital panel meters

    Please don't be insulted by this question, but you are not trying to connect the ammeter across the output, are you? Bob
  8. BobK

    Knight Rider K.I.T.T. Scanner

    Looking at this again, the part I reccommended is a 3.3V part. For your purpose, you probably want a 5V part because that is about what you will need for blue LEDs. So PIC16F1517 would be a better choice. It costs 3 cents more. Bob
  9. BobK

    Knight Rider K.I.T.T. Scanner

    That is overpriced. It is also an older chip, which means it has less power and performance and costs more than newer chips. PIC16LF1904 would be a good choice and it is $1.99 in quantity 1 from Microchip direct. To drive that many LEDs you want to use darlington arrays, like the...
  10. BobK

    Sign with 175 LEDs

    Nicely done! Bob
  11. BobK

    Sign with 175 LEDs

    Where are the pics? Bob
  12. BobK

    Looking for oscillator and frequency divider schematics

    Keep us posted. I would like to see what you come up with. Bob
  13. BobK

    Knight Rider K.I.T.T. Scanner

    I would go with the 40 pin. Much simpler to program for a beginner than trying to use serial I/O or shift registers. You can get 40 pin DIP PIC microcontrollers. Bob
  14. BobK

    Help understanding SNR of a radio reciever

    A regernerative receiver uses RF feedback, not audio. Bob
  15. BobK

    Help understanding SNR of a radio reciever

    There is no way you were getting RF feedback from your guitar speaker to the strings. Bob
  16. BobK

    15 - 20 kHz Traingle Wave Generator

    Let me google that for you Bob
  17. BobK

    Common-Base amplifier explanation?

    Current flows from positive to negative. Because electrons have a negative charge, current flows in the opposite direction from electrons. But that is just a convention. Bob
  18. BobK

    Minimal build circuit help

    Okay, I suppose. What is a pentester? Bob
  19. BobK

    Woo-Woo Why are there countless attempts to make magnets power generators..

    Moha, I think you are speaking to no one at this point. Bob
  20. BobK

    Minimal build circuit help

    I would suggest that you not try to use this to break into hotel rooms. Bob
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