[NewCandle] Relaxation oscillator for LED laser driver

[Dr Stiffler]

Horace Heffner wrote:
>
> 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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>
> Please be advised that the content of any correspondence to me, Horace 
> Heffner, is placed into public domain unless otherwise specified by 
> prior written agreement. I can be contacted at: 
> hheffner at mtaonline.net. However, by sending unsolicited information to 
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>
> Best regards,
>
> Horace Heffner
> http://www.mtaonline.net/~hheffner/
>
>
>
>
>
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Horace;

Here is a link or ref to what I mentioned above;

http://www.mail-archive.com/vortex-l@eskimo.com/msg23069.html


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