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8th April 2003, 09:48 PM
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#1 |
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diyAudio Member
Join Date: Nov 2002
Location: NZ
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what Vdrop do u get across a Good or bad LED ?
eg 12v ,1k resistor in series,
thanks 
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8th April 2003, 10:06 PM
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#2 |
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diyAudio Member
Join Date: Nov 2002
Location: Florida
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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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15th April 2003, 11:39 PM
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#3 |
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diyAudio Moderator Emeritus
Join Date: Jan 2003
Location: Near London. UK
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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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