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  1. hevans1944

    What does impedance mean?

    Impedance, Z, is the "resistance" or opposition to the flow of alternating current. It is the algebraic sum of a purely resistive term, R, and a purely reactive term, X. Both R and X are measured in ohms but they are quite different. The reactive term is a function of frequency; by definition...
  2. hevans1944

    Help With an Equation

    You take the equation(0.1/5) = 0.02 = (Rds/(RL+Rds)) and use algebra to solve for RL = 49Rds. There are usually limits (a range of suitable values) for Rds. Plug one in and multiply by 49 to get RL.
  3. hevans1944

    position sensor turning on leds

    I found a thread on another forum here that describes a National Instruments or Texas Instruments LM3914 LED display driver that will do exactly what you want. Just add an LED bar readout for the display.
  4. hevans1944

    Inductive Voltage Help

    You didn't say what your application is, but it sounds like you may want to sense the near proximity of two coils that can move with respect to each other. The Texas Instruments LDC 1000 Inductance to Digital Converter will do this using just one coil and a passive planar conducting surface...
  5. hevans1944

    Yo, World!

    You can easily see the progression from where I am sitting. My dad purchased Lionel "O" gauge, three-rail, AC operated trains in the late 1940s and early 1950s because this is what was readily available. HO scale was there, but quite expensive at the time. I bought my first-born son an HO...
  6. hevans1944

    Yo, World!

    I just now discovered this forum, which looks like it might be pretty interesting. I am a semi-retired electrical engineer who started off "messin' 'round" with electricity and electronics at about the age of six. Dad brought home a Lionel electric train set for Christmas that year. I didn't...
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