digital radar speedometer

Discussion in 'Physics' started by mubarakrocky, Oct 19, 2010.

  1. mubarakrocky

    Thread Starter New Member

    Oct 19, 2010
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  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    That very circuit has appeared numerous times. I am not aware of anyone who has actually reported that it works. Ask yourself, why does the distance need to be "exactly" 90 m?

    John
     
  3. Wendy

    Moderator

    Mar 24, 2008
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    Hmmmm, if it uses a laser wouldn't that be a LIDAR?

    The basic circuit is pretty suspect.
     
  4. BillB3857

    Senior Member

    Feb 28, 2009
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    From what I see, there is no synchronization or time comparison between the laser driver ( a free running oscillator) and the clock driving the counters (another free running oscillator). I agree that the drawing, although interesting, would not do what it is supposed to do.
     
  5. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    I think the "exactly 90m" is so it comes close to km/h, since there isn't enough logic to do a calculation.

    Overall, I'd rate the circuit as a "curiosity" rather than something functional or useful. e.g. Techy gag gift for fun or similar.
     
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