inline resistors w/ leds

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zzachattack2

Member - Posts: 19

Joined: March 16, 2006

Posted: June 01, 2006 at 11:57 PM / IP Logged

Is there a maximum voltage that can be applied to LED's? I only ask because most inline resistors for LED circuits only act as current limiters, and still allow the 12 or 14.4 or whatever voltage to be applied across the LED (assuming they are not in series). Either there is something I'm missing, or my understanding of basic electric laws has become fuzzy.

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doibuy

Copper - Posts: 177

Joined: March 15, 2006

Posted: June 02, 2006 at 6:57 AM / IP Logged

most LEDs (for alarms) are 2 Volt not 12. If you try to connect them directly to 12 V they will "burn out" immediately. The resistor is limiting the voltage flow to 2 V instead of the common 12 - 14 V in a car electrical system

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zzachattack2

Member - Posts: 19

Joined: March 16, 2006

Posted: June 02, 2006 at 10:17 PM / IP Logged

Yes i know that, its because there is no resistance in the circuit since, diodes do not act as loads or carry a real resistance.

But nevermind, I figured it out. For calculating the resistor use (Vsrc - Vled)/Current of LED

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inline resistors w/ leds

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