[NewCandle] Relaxation oscillator for LED laser driver

[Horace Heffner]

The following JAMECO Puzzler may even be of interest with regard to  
circuits for driving ordinary arrays of LEDs.

http://www.jameco.com/Jameco/PressRoom/puzzler1.html? 
emc=el&m=303214&l=2&v=d3c016d756

http://tinyurl.com/bvep5e

The solution is here.

http://www.jameco.com/Jameco/PressRoom/Puzzler1correct.html

http://tinyurl.com/cbyz6k

It might be interesting to compare light output of a relaxation  
oscillator vs an LC resonant driver circuit for an array of ordinary  
LEDs.  This would tell if some benefit is obtained from the "free"  
sloshing current obtained via LC resonance, since light output is a  
function of current and not I*V.

Fig. 1 is a circuit that might be of interest for examining a  
"current sloshing" effect.

   ----P1---
   |       |
   |       |
   ---ooo---
      ===  T1
   ---ooo-------------
   |                 |
   |            D1   |  D2
   |         ---|<|--o--|<|--
   C1        |              |
   |         A1             A2
   |         |              |
   |         --------o-------
   |                 |
   -------------------

       Fig.1

A1 and A2 are LED arrays.  Don't need D1 and D2 because LEDs are  
diodes, unless better protection is required for reverse EMF.   Power  
supply P1 might be a relaxation oscillator based pulse source or an  
inductive feedback flyback oscillator using a sense coil on T1.

All just food for thought.

Best regards,

Horace Heffner
http://www.mtaonline.net/~hheffner/