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  1. (*steve*)

    New layout sucks

    I tried valiantly to use the new layout, but I've had to go back to the old format to regain lost functionality (especially, but not limited to the mobile platform). I've reported some of the problems with the new format, but our new administrators must be too busy to address them. I'm back to...
  2. (*steve*)

    what do I have here?

    Unfortunately the lowest frequency I could get was 22kHz. I have another that is 52kHz. It seems like each crystal was individually tested. They come with a form having hand-written specifications written on it.
  3. (*steve*)

    what do I have here?

    It certainly could be :-) Any guesses to the frequency?
  4. (*steve*)

    what do I have here?

    This looks interesting. Anyone have any guesses what it is?
  5. (*steve*)

    weird DMM voltage readings

    The key measurement is the voltage across the resistor. That will tell you if any current is flowing. It is possible you will find that value is also zero (although I suspect you won't). You might then ask why 0 + 0 = 3.31, and my answer is that you may have a white led, or some other LED...
  6. (*steve*)

    MilliOhmmeter

    Clearly then your reason for posting is not to help others.
  7. (*steve*)

    Series Parallel Problem

    Perhaps you can post the equations you derived and we can take a look at them. You may need to post any markup you've made on the original diagram if you have added any new non-obvious variables.
  8. (*steve*)

    Buck Converter with PİC16F877A

    There's some superfluous stuff there (D1, C1), but what would be the effect of changing Q1 for a P channel mosfet? Would it address one of Harald's criticisms? What is the minimum voltage between drain and source in this circuit vs. one with a P channel mosfet? Is this important? Also, what...
  9. (*steve*)

    MilliOhmmeter

    See items in red. There's heaps of stuff. You could point out the kelvin measuring technique (and possibly even the construction of the probes) The circuit appears to have rechargeable lithium batteries with charge management. This alone would be interesting. How does it work? The...
  10. (*steve*)

    Series Parallel Problem

    Can you apply KVL and KCL to this circuit? Did you learn to use this to determine all voltages and currents in a circuit?
  11. (*steve*)

    MilliOhmmeter

    It's because I don't know your motivation. You're not asking a question, the post is not in response to a question, you don't appear to have built one, you're not doing this to explain some interesting concept, you're not suggesting an improvement or describing a fault, and the photos (and...
  12. (*steve*)

    MilliOhmmeter

    That doesn't answer the question. Have you made one of these yourself? Why do you post Russian versions of the schematics? What is your motivation?
  13. (*steve*)

    Lab Volt Model 790A will not power up

    More important might be the voltage rating of the resistor. If the voltage across the resistor is high (as it may be in a high voltage voltage divider) you need to be aware of this. Check the datasheets. You may find that you need to use a higher wattage resistor due to this (higher wattage...
  14. (*steve*)

    Series Parallel Problem

    I guess so. I was hoping the OP would volunteer what he has been taught.
  15. (*steve*)

    Series Parallel Problem

    That circuit can't be simplified using simple formulae for resistors in series and parallel. You need to employ another type of circuit analysis. What other methods do you know?
  16. (*steve*)

    MilliOhmmeter

    Actually those clips have one connection per jaw, and the jaws are not electrically connected (other than when they close on each other).
  17. (*steve*)

    MilliOhmmeter

    Why do you post other people's projects? Just curious.
  18. (*steve*)

    Buck Converter with PİC16F877A

    Perhaps you need to think what has to be done to turn the mosfet on and off. Look at what you're doing with the optocoupler and make sure it changes the state of the mosfet.
  19. (*steve*)

    RGB leds color changing help...

    Thanks for that explanation Harald. I wonder if that is why we sometimes refer to high voltage as "high tension"?
  20. (*steve*)

    My brand new oscilloscope

    Maybe 50mV is what it's supposed to be:
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