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  1. CircutScoper

    Help with reading an LED Datasheet

    Note that 30mA is the absolute maximum rating. Continuous operation at absmax may not be compatible with a long service life.
  2. CircutScoper

    automatic forward reverse motor with limit switch and relay

    A somewhat simpler solution from another thread. https://www.electronicspoint.com/forums/threads/reversing-polarity-through-signal-from-mouse-switch.293361/page-2#post-1829782
  3. CircutScoper

    Reversing polarity through signal from mouse switch

    Wasted a diode.
  4. CircutScoper

    Reversing polarity through signal from mouse switch

    No need for fancy (and expensive) latching or impulse relays. An ordinary relay can latch itself with the help of a couple diodes.
  5. CircutScoper

    How do I make an opamp stereo mixer?

    Not bad for a mental calculation. What surprised me was that I actually remembered 6200 is a standard 5% value.
  6. CircutScoper

    How do I make an opamp stereo mixer?

    That's the right idea, although maybe a little extreme. 6.2k, thus -20dB at the midpoint, might be a bit better.
  7. CircutScoper

    How do I make an opamp stereo mixer?

    Sorry, but a gain change of only 5:1 (14dB) over fully half of the pot's rotation is not a log taper. Midscale of a true log response should be the square root (geometric mean) of the endpoints. E.g., 0.1 (20dB) for 0.01:1 (40dB), 0.03 (30dB) for 0.001:1 (60dB) Here's a pretty good discussion...
  8. CircutScoper

    How do I make an opamp stereo mixer?

    Not really much of a logarithmic effect, since the max impedance (i.e. at mid-scale) of a 100k pot is only 25k, making the mid-scale amplitude ~0.19 instead of 0.5.
  9. CircutScoper

    How do I make an opamp stereo mixer?

    I wonder what R117 and R217 are supposed to accomplish?
  10. CircutScoper

    How do I make an opamp stereo mixer?

    I'm pretty sure the TL07x need at least 10V rail to rail.
  11. CircutScoper

    Potential energy of suspended mass expressed in kWh

    The science doesn't care a whit whether g = 9.8m/s^2 or 32.2ft/s^2, the foot can be defined in terms of the wavelength of krypton emitted light just as easily as the meter can, absolute zero is 0.0 degrees in both Kelvin and Rankin, and so on. G = 3.19x10^13 cubits/fortnight^2 would work just...
  12. CircutScoper

    Potential energy of suspended mass expressed in kWh

    Geee! Meanwhile, 8.17kWh is just enough to raise 1000 tonnes (i.e., 1000 x 1000kg = 1Gg) 3m.
  13. CircutScoper

    battery in 0%

    My understanding is that "yes" is the answer to both questions.
  14. CircutScoper

    Potential energy of suspended mass expressed in kWh

    No error that I can see. Meanwhile, we have... 1 Joule = 10^7 ergs 1 bar = 10^5 Pascals 1 Tesla = 10^4 .Gauss ...which are at least as arbitrary, anti-mnemonic, and certifiably silly as anything you'd find in SAE. Besides which, 12 has twice as many factors as 10.
  15. CircutScoper

    Potential energy of suspended mass expressed in kWh

    Actually, 1Mg x 980cm/s^2 x 300cm = 294,000,000,000ergs = 0.00817kWh. If you'd just said you prefer cgs to mks in the first place, we could have saved some time and bandwidth.
  16. CircutScoper

    Potential energy of suspended mass expressed in kWh

    The calculation might have gone smoother if you'd used 1000kg x 3m x 9.8N/kg = 29.4kJ = 0.00817kWhr.
  17. CircutScoper

    Why Raise Capacitance in Smoothing Caps?

    Another ploy is to minimize the effect of ripple by making the load more tolerant of it. E.g., by using a voltage regulator with a lower drop-out voltage.
  18. CircutScoper

    Why Raise Capacitance in Smoothing Caps?

    Yup. Vpp-ripple = Load / C / F / 2 Load in Amps, C in Farads, F = mains frequency in Hz
  19. CircutScoper

    Why Raise Capacitance in Smoothing Caps?

    Yeah. Ripple. Smoooooth!
  20. CircutScoper

    Potential energy of suspended mass expressed in kWh

    They lost me when they wrote that 2kg x 12m x 10m/s^2 = 240 Newtons
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