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Re: LED values? [message #30350 is a reply to message #30349]

Wed, 02 February 2005 03:33

Wayne Parham
Messages: 18791
Registered: January 2001

Illuminati (33rd Degree)

Light-emitting diodes are like other diodes, in that they are formed by a semiconductor PN junction. The semiconductor material of the junction is what sets the voltage required to forward-bias it. For example, germanium diodes are forward biased at 0.3v and silicon diodes at 0.7v. That's what sets the operating voltage of a silicon of germanuium transistor too.

Light-emitting diodes use different semicondutor junctions to provide different colors, and each has a different forward-voltage requirement, usually between 1 and 4 volts. The typical red LED requires about 1.7 volts. Semiconductor junctions that provide higher frequency colors require higher forward voltage bias.

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[Message index]

		LED values? By: colinhester on Tue, 01 February 2005 20:35
		Re: LED values? By: Wayne Parham on Wed, 02 February 2005 03:33
		Red lead By: PakProtector on Wed, 02 February 2005 05:55
		Re: Red lead By: Wayne Parham on Wed, 02 February 2005 07:02
		interesting... By: PakProtector on Wed, 02 February 2005 07:42
		Re: interesting... By: Wayne Parham on Wed, 02 February 2005 08:33
		Re: LED values? By: colinhester on Wed, 02 February 2005 16:13
		Re: LED values? By: cheetah on Wed, 02 February 2005 13:34

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