[sdiy] diy frequency counter

[Ian Fritz]

At 09:17 PM 10/27/2009, Dave Manley wrote:
>Way back in the 70's I modulated a incandescent bulb with audio and 
>detected it with a solar cell.  It sounded as good as the crappy 
>transistor AM radio that was feeding it.  If that works, I'm sure a LED is 
>much better.  Off to "the google"... I'm guessing the capacitance of the 
>LED sets the modulation rate, and capacitance can't that high.  Look at 
>the rise/fall times here (measured in nS):
>
>http://www.vishay.com/docs/80097/physics.pdf


That's an OK reference for semiconductor physics, but this one is much better:
http://britneyspears.ac/lasers.htm

Ian