[NewCandle] Relaxation oscillator for LED laser driver

[Horace Heffner]

If you read my post you will see that I am not questioning the  
existence of the diodes, only stating I could not find a match to the  
specs (you gave) in any listing for the 1N4148.  They were sold under  
various part numbers by various vendors. What I actually asked for  
was an exact part number and vendor - which was not forthcoming as I  
recall.

Best regards,

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



On Feb 5, 2009, at 10:53 AM, Dr Stiffler wrote:

> 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 this address, the sender agrees to place it in  
>> public domian and to make it available for immediate posting to  
>> public news forums.
>>
>> 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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