Search results

Search Forums New Posts
  1. BobK

    clap based volume control

    I read the description and understand how it is supposed to work. I am saying that I don't believe it would work. Transistor T1 is turned hard on by the 10K resistor to the base, making it's output low. I don't think the mic could ever produce a strong enough signal to make it go high. And...
  2. BobK

    Simple Counter Help

    This is easily done with a microcontroller, not so with discrete logic. If you want to build this, you have a lot to learn. Bob
  3. BobK

    Capacitor Help

    Guess what, there are physical limits to all electronics parts, you can't just make them do what you want. You will not find a 200 mAH battery that can produce 2.2A. Generally, batteries can produce about the same current as their capacity rating. So you need a 2200 mAH battery to safely...
  4. BobK

    clap based volume control

    I would be very surprised if that circuit would work. If the microphone produces a signal at all to trigger the counter, I don't see how it could produce only 1 count per clap. I would expect multiple counts. Bob
  5. BobK

    Simple Counter Help

    Your variables look a lot like constants to me. Please try to explain in more detail what you are trying to do. Where are these "variables" coming from and how are they encoded? How many of them. What kind of display? Bob
  6. BobK

    Capacitor Help

    Why did you think a capacitor is the correct solution? 3 C sized NiCad cells would easily supply 2.2A for 5 seconds many times on single charge, and would be far smaller than the capacitor needed to do the same. Bob
  7. BobK

    To the ADMIN(s)

    To the people experiencing this problem (I am not one), which browser? Bob
  8. BobK

    Bipolar Junction Transistor(BJT)

    Couldn't find anything on the internet then, I guess? Bob
  9. BobK

    1 basic question

    A two prong device should not be able to tell the difference between hot and neutral. If it can, it has a ground fault. Bob
  10. BobK

    1 basic question

    It will work, but you will not have the same protection from electrical shock. IXP
  11. BobK

    Wattage

    Depends on the values. If they the 3 resistors are the same value, the wattage is tripled either way. If they are not, you would have to calculate how much current goes through each. For example, if you parallel a 1 Ohm resistor with 2 1 MOhm resistors, it will still have a power rating...
  12. BobK

    micro processing ??

    No, just a voltage divider, and possibly a voltage reference if you are not running off a regulated supply or need more accuracy than the supply voltage. Basically, if you put any voltage on the - input of the comparator, then the compartor will turn on when the + input exceeds that voltage...
  13. BobK

    Amplifier noise/heat up the wazoo (TDA2009)

    Of course, all the grounds NEED to be connected together! Bob
  14. BobK

    counting box

    The one you are most comforatble with. Any uController with the needed number of inputs and outputs will do it. I would use a rotary encoder for the "dial up the count" feature, becuase a pot would be too difficult to control accurately from 0-9999. So you need two pushbuttons and a...
  15. BobK

    counting box

    What experience do you have? This is not a beginner project. Bob
  16. BobK

    Helpful Tool

    Steve, Are you saying he hasn't a Clue? I glanced at the survey, and declined to participate. Bob
  17. BobK

    Is anyone using DesignSpark PCB?

    I use ExpressPCB for my DIY boards (and I have had them manufacture prototype boards as well). Their free software is by far the easiest to use that I have run across. Particualarly, adding new parts is a breeze, as opposed to Eagle where it is tedious to say the least. For one thing, you can...
  18. BobK

    counting box

    Microcontroller. Bob
  19. BobK

    12vdc to 12vAc

    Get a bridged car audio amp and drive it with a 50 or 60 Hz sine wave. Bob
  20. BobK

    Easiest question ever

    That was easy. Bob
Top