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  1. BobK

    Controlling DC Lego motors with an old Blackberry?

    I don't think so, but I have been known to be wrong once in a while. The charge port is most likely connected to a charge controller IC, not directly to the battery. And there would be no way for you to turn it on and off from the phone anyway, so you could not control even one motor with it...
  2. BobK

    An interesting pipe dimmer project

    The lamp, in the circuit diagram you linked, is the lamp being dimmed. I don't think you want to change that to a DIAC. Bob
  3. BobK

    Controlling DC Lego motors with an old Blackberry?

    I would not be so sure of that. The charging connector is an input to the phone, not an output. Bob
  4. BobK

    LM317 question

    You could, but you would lose regulation since the diode will have a different voltage drop at different currents. The diode backwards from Vout to Vin is there to protect from capacitors on the output side feeding a voltage back into the output pin of the LM317 when the power is shut off. It...
  5. BobK

    PIC mcu memory question

    Uh, no, the OP explicitly said he was wanting to read the RAM, not the program memory. Bob
  6. BobK

    Cheap or freeware circuit simulator programs?

    LTSPICE Bob
  7. BobK

    need help in controlling the voltage in a circuit

    How about using a lower voltage relay. Bob
  8. BobK

    An interesting pipe dimmer project

    Don't ask your wife to buy the potting mix. If it were my wife, I would definitely get the wrong thing :) Bob
  9. BobK

    pic18f6520

    Microchip Bob
  10. BobK

    Simple wiring problem

    I would think that a transformer rated at 12V 250W would not drop anything like 1.8V when drawing only 5.6A. I wonder what the output voltage would be at 20A. I suspect that that 250W rating is wrong. Maybe it is 25W? Bob
  11. BobK

    Automatic battery charging circuit

    For charging LiIon batteries, I presume? You can get these on Ebay for a couple of bucks. Bob
  12. BobK

    Help Choosing Battery For Project

    Well, maybe it is because you didn't give the information needed to answer your question. The important missing pieces are the current drawn by the motor, and how long you expect it to run on the battery. Oh, and you would not put the battery in series with the solar cells as in your...
  13. BobK

    PIC mcu memory question

    I give up. Bob
  14. BobK

    9V Power Supply using Solar Panel

    I guess that depends on your skills. Try googling for one and see if it looks doable. Bob
  15. BobK

    Simple wiring problem

    So, at 10 feet the resistance of 16 AWG wire is about 0.05 Ohms. At 5.57 A the voltage drop is 0.27V. To drop 1.6V you would need to drawing 32 A. Something is wrong. How did you measure the current draw. Are you sure the transformer is 250W? That is going to be a pretty big...
  16. BobK

    help with circuit PLEASE!

    No, it is an astable multivibator. No, any chip will do :) Of course it matters. What input? There is no input in the circuit diagram you posted. Bob
  17. BobK

    PIC mcu memory question

    Why not explain what you are trying to do. Data memory is constantly changing during the running of a program, and does not contain anything when the chip is powered off. Bob
  18. BobK

    Any suggestion of logic analyzer?

    Do you really have a homemade hardware project that would require 100MHz? I sure have never reached that height. Bob
  19. BobK

    Resistors and organization

    I use a cabinet myself, with draws for each E6 value (and the higher E12 etc ones go in the same drawer). Another thing I have seen that appeals to me is a binder with plastic sheets with pockets in them. You can get these as office supply store. That might be a good way to organize your...
  20. BobK

    PIC mcu memory question

    You mean the RAM? The RAM is in random state whenever the chip powers up, so there is nothing there to read unless the chip is running. Bob
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