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  1. poor mystic

    Measuring digital coincidence

    Hi Lou Welcome to Electronics Point :) "What does it mean to measure logic coincidence signals on TTL/cmos logic boards?" It's the kind of thing that might be useful in chasing faults on a digital circuit, where you might have a fault which is indirectly related to a logic level on another...
  2. poor mystic

    Mobile phone chargers

    :) You could put a slightly too-big load on the device and check for ripple, using your multimeter. Then again, hmmm. It can be quite a little project to set up a variable load.
  3. poor mystic

    RF filter tuning

    :) or try this... Line-up without test gear There are limited options for doing the same job with no test equipment, but people succeed nevertheless. Usually a carrier wave is modulated with a tone and the set under test is tuned so that the tone can be heard. The RF stages are adjusted to...
  4. poor mystic

    Repair ionization wires on Ionic Breeze Quadra S 1637 air cleaner

    http://www.sisweb.com/ms/wire-tungsten.htm I think you're on the right track. "Go ahead" is my 2 cents.
  5. poor mystic

    12v LED resistors

    It's a good avatar but a bit low-resolution for my poor eyes. Looks like the red lead goes in the left-hand hole to me... is that marked 10A?
  6. poor mystic

    looking for CS7 Thermostat

    :) Re: "Is it correct to deduce that it opens at 145°C approx.?" A teacher of logic would say that it is fundamentally incorrect to deduce any such thing! Please excuse any irony in my reply. Errors in characterising electronic components can be fatal - even literally so if bad design is also...
  7. poor mystic

    Basic question - current

    There is a sea of electrons associated with the wire. When a current flows along the wire, for every electron that enters the wire, an electron leaves it. The electrons are supplied by the metallic atoms which make up the wire.
  8. poor mystic

    Correct voltage translator

    Still, as BobK says, 21.6 MHz is a very high pulse rate to be coming from a motor. Even with gearboxes. There's a credibilty gap,.. I can't believe it, I'm sorry...
  9. poor mystic

    Will a lightbulb inside a ceramic cube generate far infrared?

    :) Voltaic - it feels like you're trying to learn some rather subtle things about quantum physics by asking a series of questions. It's difficult for me to answer some of these questions, firstly because this is not my specialty area, and second because the questions don't seem quite right...
  10. poor mystic

    Capacitors

    Even with that arrangement, the capacitor is prevented from complete discharge. The output 1N004 will prevent discharge below about 0.6V no matter how long you wait. So there's always a charge left on the capacitor. (PS that's because the diode won't conduct below 0.6V.)
  11. poor mystic

    Will a lightbulb inside a ceramic cube generate far infrared?

    Sound can be used as an analogy. Imagine a piccolo being played in its upper registers, with lots of birdsong and bats squeaking; this will be my analogy for light. The high frequency sounds are at a range of frequencies, just as light is in a range of colours. Now imagine an army of monsters...
  12. poor mystic

    Correct voltage translator

    :) Hi Vindhyachal Could we hear a little more about the motor and what it's being used for please?
  13. poor mystic

    Correct voltage translator

    or perhaps measurement is being done at the motor and the shaft speed is given for a low-speed output shaft, driven through a gearbox.
  14. poor mystic

    Will a lightbulb inside a ceramic cube generate far infrared?

    Far infrared is heat. Heat is far infrared. Every form of energy winds up as heat. The infra-red generator you describe cannot fail Hmm... you're not trying to make a far-infrared laser by any chance, are you? (You have a lot of seemingly related queries.)
  15. poor mystic

    Wanted: Reference Wireless World magazines

    I wouldn't be surprised if they've gone out of business. Sad.
  16. poor mystic

    Wanted: Reference Wireless World magazines

    Wooh! What I wanted from the WW mags (June 1984?) was an alternative to the Cockroft-Walton pump. This alternative, better ladder was designed partly by someone Purves or Purvis. I had wanted to bring the "Purves Pump" to the attention of some op, or so I seem to recall.
  17. poor mystic

    Nichrome heating

    :) Not necessarily. Post a photo of what's happening.
  18. poor mystic

    stepping down voltage twice

    :) I'm thinking of the 7812 as a very high impedance voltage source, supplying another such voltage source, probably supplying a constant load R. So the 7812 sees the 7805 as a high impedance constant current sink. The path between the devices strikes me as being a nice potential home for a...
  19. poor mystic

    Simulator Simon

    :( I have never posted an upside-down smile before now. That is large money, and in the extraordinary event that I were to wish to pay I would use a temporary credit card. My guess (not as good as your own guess?) is that this software is most likely to be used by a chemist. A transition metals...
  20. poor mystic

    Can capacitor be made with 2 pennies + paper?

    Interesting. Training as a technicians, we were shown that capacitance needs to be measured in terms of charge per volt, i.e. a charge of 1 coulomb for a potential of 1 Volt is the same as a capacitance of 1 farad. I just looked at the Wikipedia entry for capacitance but my curiosity about...
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