what Vdrop do u get across a Good or bad LED ? - diyAudio
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Old 8th April 2003, 10:48 PM   #1
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Default what Vdrop do u get across a Good or bad LED ?

eg 12v ,1k resistor in series,

thanks
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Old 8th April 2003, 11:06 PM   #2
Jeff R is offline Jeff R  United States
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About a volt in the forward (on) direction if good. If you see 12 volts, the device is obviously bad if hooked up correctly. But if you have voltage and a resistor, the LED will turn on if it is good and you hook it up in the right direction, so you can measure the voltage directly.
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Old 16th April 2003, 12:39 AM   #3
EC8010 is offline EC8010  United Kingdom
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1.7V for a red LED. More for other colours (up to about 3.6V for blue).
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