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Strobe Lights.

Discussion in 'Electronic Repair' started by [email protected], Feb 9, 2009.

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  1. Guest

    I am watching How It's Made on the SCI channel.The tv program guy said a
    strobe light can be ajusted to make it appear a moving fan blade has
    stopped.Is there another way to do that without the flickering of using
    a strobe light?
    cuhulin
     
  2. Guest

    The "flickering" is what makes the blades appear to stop. If the
    light flashes when the blades are in exactly the same position they
    were in the previous time the light flashed, you will not perceive
    that the blades are turning.

    This can be a safety hazard when machinery running at certain speeds
    is illuminated by fluorescent lights - the on and off of the
    fluorescent bulb with every cycle of the AC voltage can make the
    machinery appear to be stopped (yes, I know it's a simplified
    explanation).

    John
     
  3. Sure: how fast can you blink your eyes?


    --
    Personally, I like Vista, but I probably won't use it. I like it
    because it generates considerable business for me in consulting and
    upgrades. As long as there is hardware and software out there that
    doesn't work, I stay in business. Incidentally, my company motto is
    "If this stuff worked, you wouldn't need me".

    - lifted from sci.electronics.repair
     
  4. CJT

    CJT Guest

    Spin yourself at the same speed as the fan.
     
  5. Yukio YANO

    Yukio YANO Guest

    It just occurred to me that the strobe lights and circuits take a
    finite amount of time to charge ! and discharge very quickly to give the
    flashing strobe effect.

    It also occurred to me that superbrite white LED's should fire very
    quickly so by using a 555 timer and an appropriate driver would give you
    a quick strobe ! Without that recharging delay !!

    I will have to try this on my testbench soon !

    Yukio YANO
     
  6. Could work, would be interesting, but wouldn't be able to touch a xenon
    tube for brightness.


    --
    Personally, I like Vista, but I probably won't use it. I like it
    because it generates considerable business for me in consulting and
    upgrades. As long as there is hardware and software out there that
    doesn't work, I stay in business. Incidentally, my company motto is
    "If this stuff worked, you wouldn't need me".

    - lifted from sci.electronics.repair
     
  7. GregS

    GregS Guest

    Nothing new. You can pulse to the LED's peak rating. The longer the pulse the brighter it
    appears.

    You could also use LCD glasses to view the fan.


    greg
     
  8. PeterD

    PeterD Guest

    Turn off the fan. The blades will be clearly stopped.
     
  9. Guest

    I work on and do tune ups on my own vehicles.I know about using an auto
    strobe/timing light.

    When I was watching that How It's Made tv program, I figured it would be
    ''cute'' if the rotating fan blade on my old antique electric table fan
    could appear to stop rotating.That is what the How It's Made program
    showed on tv.I still think it is a ''cute'' idea though.
    cuhulin
     
  10. GregS

    GregS Guest

    Just keep it away from kids.

    greg
     
  11. Guest

    I like those Western movies, when the wagon wheels look like they are
    running backwards.
    cuhulin
     
  12. They were. Didn't you know they shot all action scenes backwards back then?

    You can imagine how hard it was for all them actors to learn to talk
    backwards.


    --
    Personally, I like Vista, but I probably won't use it. I like it
    because it generates considerable business for me in consulting and
    upgrades. As long as there is hardware and software out there that
    doesn't work, I stay in business. Incidentally, my company motto is
    "If this stuff worked, you wouldn't need me".

    - lifted from sci.electronics.repair
     
  13. Franc Zabkar

    Franc Zabkar Guest

    I have a Ministrobe kit designed by Electronics Australia in August
    1997. It uses exactly those components.

    - Franc Zabkar
     
  14. Dave

    Dave Guest

    Sure. Turn the fan off.
     
  15. GregS

    GregS Guest


    Grab it.
     
  16. Guest

    It is 70 degrees outside right now.The old antique Hunter electric fan
    on the end table by doggy's end of her couch is running.
    cuhulin
     
  17. jakdedert

    jakdedert Guest

    Stick your nose in it....

    jak
     
  18. Guest

    Outch!
    cuhulin
     
  19. whit3rd

    whit3rd Guest

    Yes, you can hold a strobe disk up to your eye.
    This is a painted-black disk with one slot, spun
    (often by hand) so as to block a peephole. Instead
    of turning the light on/off, you block your line of sight to the fan
    except during the slit-crosses-the-peephole instants.

    It doesn't have to be your eye, of course, you can
    put a camera behind the peephole and observe the photograph
    in any lighting you find desirable...
     
  20. whit3rd

    whit3rd Guest

    Maybe, maybe NOT. The 'white' LEDs use blue or UV emitters
    and phosphors, so part or all of the light output is delayed.
    A gas-discharge lamp (like xenon or even neon) has better
    timing control. It also tolerates high-brightness/low duty cycle
    better than a semiconductor.
     
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