led that does not appear to need a current limiting resi

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Jason7230
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led that does not appear to need a current limiting resi

Post by Jason7230 » Tue Jul 08, 2003 8:34 pm

I have a LED that does not need a current limiting resistor, whats going on, is this new LED technology or am I missing something.

desterline
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Re: led that does not appear to need a current limiting resi

Post by desterline » Tue Jul 08, 2003 10:56 pm

I haven't a clue as to what you have, but I have some that have an internal curent limmiting resistor and are designed to operate at 5V. I also remember seeing some rated at 12 volts in some catalog. (Digikey or Mouser I think)<p>Also I have, in the past, connected LEDs directly to a power source such as a 9V batt or a pair of penlights. The LED does not imediatly burn out. I am sure that it will shorten their life greatly.<p>
Hope this helps
Denny

josmith
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Re: led that does not appear to need a current limiting resi

Post by josmith » Thu Jul 10, 2003 3:54 pm

try curving the voltage and current. Let us know the results.

chessman
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Re: led that does not appear to need a current limiting resi

Post by chessman » Fri Jul 11, 2003 1:45 pm

BTW...I've seen 9V batteries die much faster than the LEDs do when coupled directly....<p>Anyway, there are tons of LEDs out there with built-in resistors. I used to know the name of one specific manufacturer that comes to mind...but I forget :(

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jollyrgr
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Re: led that does not appear to need a current limiting resi

Post by jollyrgr » Sat Jul 12, 2003 11:26 pm

As others have said, built-in current limit resistor. But this is a special LED similar to the flashing LEDs and is not as widely used as standard LEDs.
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