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  1. hevans1944

    electro static actuator attempt

    @ratstar always appears (at least to me) to be short on theory, but he tries to make up for it (to a certain extent) by his penchant to experiment. I like that approach when it leads to learning about something. I think it might even have a name... The Edison Method, perhaps? I hope he keeps us...
  2. hevans1944

    New to encoders and need assistance...

    I agree with you 100% regarding rotary incremental quadrature encoders. Simplest to use in most situations not requiring absolute position readout. If an index or zero position can be found with repeatable and acceptable accuracy prior to the actual backlash test, then the incremental encoder is...
  3. hevans1944

    New to encoders and need assistance...

    True. But I don't believe that I stated, or implied, that there was any difference in accuracy among the three rotary position sensors you mention. There can be significant differences in cost and required instrumentation for a given resolution and accuracy. Fortunately, if the OP sticks with...
  4. hevans1944

    New to encoders and need assistance...

    @Cliff T. The datasheet indicates that you have an absolute encoder with a gray-coded output bit stream pattern. @Minder in his post #5 mentions the more common (and much less expensive) differential encoder with two quadrature outputs, but this is not what you have, nor is such an encoder...
  5. hevans1944

    Improve flat screen TV sound.

    Looks like you have been victimized by the owners of the Electronics Point website who "translated" your Sennheiser earphone model numbers into webpage links to their All About Electronics website. If this is their way of getting more "hits" on that webpage, I think it sucks. @Harald Kapp has...
  6. hevans1944

    Wifi module IC I ordered has no pins

    You might want to check this Spark Fun page for more information on how to use it. And maybe this page, too.
  7. hevans1944

    Clueless to read capacitor._.

    The datasheet does say voltages from 2.5 to 25 volts are available, so perhaps 03 really does mean 3 volts. Since the OP is a self-described newb, it might be better if he took the mobo to a computer service shop to have the electrolytic capacitor removed and replaced. It is easy to damage the...
  8. hevans1944

    Clueless to read capacitor._.

    Just guessing, but the self-described newb may not have a clue (or the multimeter) required to measure the voltage drop across the capacitor pins, assuming the damaged cap can be successfully removed from the multi-layer circuit board and a replacement soldered in without damaging the circuit...
  9. hevans1944

    Automatic links

    I sure as hell try, but wife keeps trying to throw out all my "vintage" stuff.
  10. hevans1944

    DIY Metal detector

    Colin Mitchell, the Australian owner of the Talking Electronics website, used to post here quite often a few years ago. His website is a valuable resource for beginners trying to make sense of all things electronical (yeah, I know electronical isn't a "real" word, but IMO it should be) by...
  11. hevans1944

    Current transformer

    The datasheet describes an Allegro Hall Effect in-line current sensor that does not require a current transformer, whereas the LEM CKSR series device is a true current-transformer with either one, two, three or four primary turns, as determined by how circuit-board traces are connected when the...
  12. hevans1944

    Why is it PNP instead of PPN for transistors

    Let's not even mention PIN transistors and diodes.
  13. hevans1944

    Why is it PNP instead of PPN for transistors

    HTS sorta reminds me of man-made nuclear fusion: widespread commercial application is always just fifty years from now. And my barber shop has a sign that advertises FREE BEER... tomorrow. There is no doubt that materials exist that exhibit superconductivity at liquid nitrogen boiling...
  14. hevans1944

    Why is it PNP instead of PPN for transistors

    Double-walled glass flasks, with a good vacuum between silvered outer and inner walls were invented in the 19th century by James Dewar. Glass encloses one end of the flask, and the other end was usually loosely closed with a cork or rubber stopper. Dewar's invention was globally popularized by...
  15. hevans1944

    Why is it PNP instead of PPN for transistors

    This statement about You Tube videos actually applies to a LOT of stuff posted on the Internet, not just electronics. And it, of course, also applies to other communications media, such as the printed word on paper or as read on a video monitor. It is becoming really hard to determine what to...
  16. hevans1944

    Why is it PNP instead of PPN for transistors

    Some, not all, visible colours can be made from just three primaries. WARNING! Wall of words ahead! It's complicated, but it you understand the 1931 CIE chromaticity diagram (shown below) it becomes much clearer why any finite number of so-called primary colors.will always fail to produce a...
  17. hevans1944

    Why is it PNP instead of PPN for transistors

    We thought so, too, at the time. Of course the ubiquitous "punch contact" bread-boards, used especially to prototype construction with dual-in-line packaged (DIP) parts, became available some ten or fifteen years later (I forget when they first appeared). IIRC, the lab where I was working at...
  18. hevans1944

    Why is it PNP instead of PPN for transistors

    Getting "pissed off" just because you don't know WTF you are doing is not an effective way to learn almost anything. It's a good thing you didn't start trying to learn electronics with vacuum tubes containing thermionic emitters, one or more plates (anodes), and several wire grids or...
  19. hevans1944

    Weight scale programming logic

    It has been awhile (1960s to 1970s time frame) since I have worked with commercial load cells. AFAIK, all load cells are analog devices, Wheatstone bridge configurations of thin-film strain gauges, often with temperature compensation. The digital "magic" only enters the design after the load...
  20. hevans1944

    Solar lead acid battery housing

    Once, while I attended grade-school in the 1950s, our teacher asked us (the students in her class) to clip and bring to class for "show and tell" an article-clipping that said something about science. This was, IIRC, right after the Ruskies shocked the world by orbiting the first man-made...
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