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Re: LED & Resistor befuddlement


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The LED also has to be visible.





Re: LED & Resistor befuddlement
On Wed, 02 Jun 2004 19:07:44 -0400, the renowned rickman

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1.0 V @ 0.06uA
1.94V @ 1uA (visible in dim light)
2.23V @ 4uA
2.59V @ 100uA (quite visibly lit)
2.79V @  1mA
3.08V @  10mA (blindingly bright)

Best regards,
Spehro Pefhany
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Re: LED & Resistor befuddlement
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What type of LED is this?  I have never seen one that was "blindingly
bright" at 10 mA and I have not seen one with a 3 volt Vf.  Can you test
a standard red LED that is designed to operate at 10 to 20 mA?

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Rick "rickman" Collins

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Re: LED & Resistor befuddlement
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Never seen a superbright blue led? They ARE blindingly bright at 10mA and
almost hurt your eyes at 20mA.
And yes, blue LEDs have a Vf of 3V

Meindert



Re: LED & Resistor befuddlement
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Ok, but I don't think the OP was working with superbright blue LEDs.
Aren't they pretty pricey?  

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Rick "rickman" Collins

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Re: LED & Resistor befuddlement
On Fri, 04 Jun 2004 11:56:50 -0400, the renowned rickman

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<35 cents in small quantity for 3,000 mcd blue.

Best regards,
Spehro Pefhany
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Re: LED & Resistor befuddlement
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How did you measure the 1.0V @ 0.06 uA ?

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Thanks, Frank.
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Re: LED & Resistor befuddlement
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I guess I should get one of those ;)

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Thanks, Frank.
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