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  1. BobK

    Upper frequency limit of an oscillator

    You would decrease the resistors to increase frequency. Bob
  2. BobK

    Magneto kill terminal...

    That is how it works on lawnmowers too. The switch shorts across the magneto coil and the spark plug which are in parallel. Bob
  3. BobK

    What to Do With a Lot of Salvaged Speakers?

    Depends on whether you are nostalgic for the days that you listened to the Washington Senators games on your little transistor radio hidden under the pillow when you were supposed to be sleeping. Bob
  4. BobK

    Magneto kill terminal...

    How does it work? You can't have a spark when the spark plug gap is shorted. No spark and the engine stops. Bob
  5. BobK

    Reducing music in videos

    For some reason, British productions seem to be particularly bad in that respect. The lovely wife Morticia clued me in that if you watch the lips (when possible) it is easier to understand the speech, and she is right even though I would never say that I was doing "lip reading." Bob
  6. BobK

    What to Do With a Lot of Salvaged Speakers?

    If the "large" center speakers in that picture can handle 10W, I've got a bridge in Brooklyn I can sell you. More likely 1 W at max. Bob
  7. BobK

    Can be TL494CN used as op-amp?

    The question would be why? Bob
  8. BobK

    Garden lights working on 18650 lithium single cell...

    When visiting Shanghai, I noted to my wife that it was unusual in a big city not to see pigeons everywhere. Then we went out for dinner and looked at the menu... Bob
  9. BobK

    Capacitor

    OMG! Where to start... A capacitor does not store either voltage or current, it stores charge. The capacitance determines how much charge is stored for each volt. If you want to store current, look into inductors. 1 bit is not a measure of charge, current or voltage. It is a unit of...
  10. BobK

    PiC micro I/O line states

    Why are you dividing it down to a voltage that is too low to be recgnized as a high? What is Vdd on the PIC? Once again, a PIC input will never source or sink 50uA, so either it is damaged, or you are not measuring this correctly. How are you measuring this current? What is the voltage at...
  11. BobK

    Please can I have some help with a boost/buck convertor?

    @kellys_eye : Bob
  12. BobK

    LM358 Replacement

    Okay, I didn't look far enough down in the datasheet. Bob
  13. BobK

    Please can I have some help with a boost/buck convertor?

    What are you connecting to the input and output when they blow? Have you tried the same power and load with the original pots installed? If you set the replacement pot to 1/2 it's rotation, it should not be able to blow anything no matter how you connect it. Bob
  14. BobK

    Program memory to be used as a Data memory in PIC24F16KA102

    Since it has only 16K of program memory, the answer is an unequivocal no. Bob
  15. BobK

    LM358 Replacement

    The standard part is -55 to +125. So, unless he needs it fail at -40 or +80, it should do. Bob
  16. BobK

    LM358 Replacement

    LM358 is widely available, why are you looking for a replacement? Bob
  17. BobK

    Electronic starter kit

    Post a link to the kit. Bob
  18. BobK

    Help needed with project

    The clean way to do this is to build a USB keyboard device using a micro. Bob
  19. BobK

    Thoughts on Voltera?

    I have been looking at this. It sounds pretty good to me. There are so many boards I haven't made because it is just too much effort, and I have never achieved better than about 75% success rate with any of the methods I have used The thought of having one tool that makes the board and does...
  20. BobK

    PiC micro I/O line states

    Something must be driving the voltage divider. What is it? What are the values of the resistors? If there is a voltage driving the resistors, you can use Ohm’s law. What is that current? The PIC input is not drawing 50uA unless it is damaged. Making the PIC pin an output and setting...
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