Posted by Damir [ 213.202.68.26 ] on February 16, 2005 at 07:26:36:
In Reply to: but... posted by Tnuctipun on February 16, 2005 at 06:52:47:
Page 47 - typical forward drop @10mA for cheap red LED is 1,7V , for the green 3,6V, for the blue 3,7V.
But, internal resistance is about 4,3 Ohms for the red, green - 30 Ohms, blue - 26 Ohms.
Author advises (pages 177- 178), that LED biasing is best for Ia>10mA, high Rl, and small output signal voltage (distortion `cos of non-linear LED resistance).
P.S. - I can`t resist, I know that you don`t like citations... 
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