Thanks for the idea! However, here I need to also keep the supply current
to a minimum.

Harold


> On June 24, 2004 01:37 pm, Harold Hallikainen wrote:
>>I'm loooking for a two terminal constant current device that could be put
>>between an LED and a variable DC supply to hold the LED current at 5mA as
>>the supply varies over a 0-10V range (recognizing we're not going to get
>>it at 0V, but I'd like the widest range possible). So far i've found the
>>Central Semiconductor CCLM5750 which is a nominal 5.750mA, but it takes
>>4.5V to get 80% of the rated current. Anyone have other ideas?
>
> Haven't tried this, but the theory seems okay.
> Put the LED in parallel with a 1N4001 diode.
> then put the both of them in series with your circuit.
>
> The LED is expecting more than .7v to run full brilliance, so it will
> probably run a bit on the dim side.
> The 1N4001 should be able to handle 1amp and acts like a 0.7v clamp on the
> LED.
>
> Select something bigger than a 1N4005 if you need to deal with more
> current.
>
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