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  1. P

    Rheostat vs PWM

    A long time ago I worked on big shunt field DC motors. I would be concerned about heating the windings from the start-stop of the PWM and inductive kickback from the windings to the PWM switch. I am thinking that adding an inductor in series to limit both effects. If you can monitor current and...
  2. P

    Anyone have any oscilloscope recommendations?

    From above (hevans1944) ....there is no way that I would go back to the old technology, except when I need the increased bandwidth my old 'scopes offer compared to what I can afford with the DSOs. This is not to say that DSOs don't exist with comparable or greater bandwidth than my 200 MHz...
  3. P

    Low power distance detection

    How about three antennas at the known location, offset in angle? The mobile receiver can detect the phase angle difference between the three signals and produce a kind of triangulation. Not a simple receiver, but I think it can be done with chips on the market today.
  4. P

    carbon steel screw versus brass screws

    I do not think the "shiny" screws are plain steel. I am quite confident that plain steel would react to the copper. It may not fail, but then again, it may. I am guessing that the shiny ones are nickle plated to avoid this issue. I do wonder if a trip to a big box retailer may get you the...
  5. P

    Detecting Leveling of Arm and Shoulder

    From what I have seen, motion studies are done using video. This would avoid the "G" problem. Any chance you could pursue that method?
  6. P

    project of tracking module using 433MHz RF module

    I suggest you get the basic part working first. The output is a single on/off. But, yes. Set the gain of the buffer amp to cover the range of 0-5 volts output when you provide min to max signal input. This will be the input to the 3914. You may not be impressed with how noisy it seems and may...
  7. P

    project of tracking module using 433MHz RF module

    Well, it may not be dependable as different environments will get different signal levels and results, but you can use this variation to turn the light on and off. I would take that signal into a buffer/amplifier op-amp. Then to a comparator op-amp with the other input to the comparator being...
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