🚀 go-pugleaf

Lizard Blizzard wrote:
> DaveC wrote:

>> On Fri, 4 Oct 2002 17:19:23 -0700, Lizard Blizzard wrote
>> (in message <anlb3a$lvte$1@hades.csu.net>):


>> If you're going to spend the money on an LM317, change it to an 
>>> LM334, which is a true current regulator.  Even cheaper might be a 
>>> JFET with the gate connected to the source.  Problem with that is 
>>> that the JFETs have such a wide range of Idss that you might pick a 
>>> dozen of them and they might all have a wide variation in current.



>> LM334: 0.79 each.
>> Using a supplimentary transistor, I can run all of the serial-strings 
>> of LEDs from one current source.
>> The data sheet says that when using the transistor in the circuit, an 
>> R and C are needed for stability. How does one go about choosing these 
>> values?

>> <http://www.dnai.com/~voicebox/misc/isource.jpg>

> For a critical app like a well regulated current source, that might be 
> important.  But for a stop light, I don't believe it will make much 
> difference.  Here's how one guy built a LED flashlight using a LM334.  I 
> checked the prices and the LM334 is cheaper at Mouser.  If you use a PNP 
> transistor, don't use the 2N3904, use the 2N4403.  It handles a lot more 
> current.


I must've forgot the URL in my lunchtime haste.
http://www.web-ee.com/Schematics/LED%20Flashlight/LEDflashlight.htm

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