[NewCandle] Relaxation oscillator for LED laser driver

[Dr Stiffler]

Horace Heffner wrote:
> 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/
>
>
>
>
>
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>
Why not just disconnect C1 and leave this connection open, but you will 
indeed need D1 & D2. Works well with 80 super white LED's.

D1 and D2 can be Vishay 1N4148's which are indeed rated at 500mA forward 
peak and 300mA If. These are the diodes you felt did not exist or at 
least questioned my specs; in a comment on vortexx.

I know of over 100 people that have driven at least 50 SW's this way. 
Why close the old loop.

Buy the way JameCo sells the Vishay 1N4148 and they take CE well over 
350 volts. Strange little guys.


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