digital radar speedometer

jpanhalt

Joined Jan 18, 2008
11,088
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
 

BillB3857

Joined Feb 28, 2009
2,562
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.
 

thatoneguy

Joined Feb 19, 2009
6,359
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

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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