[NewCandle] Relaxation oscillator for LED laser driver

[Horace Heffner]

On Feb 4, 2009, at 11:40 AM, Dr Stiffler wrote:


> 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.

C1 exists at some value whether shown or not. By pushing up the value  
of C1 the current duration is pushed up and the frequency dropped,  
and the peak voltage controlled/limited.  The current still sloshes  
back and forth, but the experiment is more controlled.

D1 and D2 might not be needed in the configuration shown depending on  
the values of L1 and C1.  Also, the fact the current path through an  
array has low resistance takes the reverse voltage load off the  
opposed array.


>
> D1 and D2 can be Vishay 1N4148's which are indeed rated at 500mA  
> forward peak and 300mA If.

I don't see the significance of those specific values. I proposed no  
specific values.


> These are the diodes you felt did not exist or at least questioned  
> my specs; in a comment on vortexx.

I don't recall this at all.  Do you have a reference?  This doesn't  
sound like me. I doubt that I would question the existence of some  
kind of diode.  In fact, I think I have a supply of 1N4148's on hand  
somewhere, or something similar with a 1000 PIV rating.


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

To measure the source of apparent brightness effects.  Also, it would  
eliminate energy loss due to capacitive linkage to the environment  
and thus heating of the environment.

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