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From: larry@kitty.UUCP (Larry Lippman)
Newsgroups: rec.audio,sci.electronics
Subject: Re: In defense of solid-state devices
Message-ID: <2134@kitty.UUCP>
Date: Tue, 20-Oct-87 22:00:28 EDT
Article-I.D.: kitty.2134
Posted: Tue Oct 20 22:00:28 1987
Date-Received: Thu, 22-Oct-87 04:37:57 EDT
References: <729@alliant.Alliant.COM> <4124@pyr.gatech.EDU> <4128@pyr.gatech.EDU> <2002@umd5.umd.edu>
Organization: Recognition Research Corp., Clarence, NY
Lines: 28
Summary: Source for blue LED's...
Xref: mnetor rec.audio:3914 sci.electronics:1598

In article <2002@umd5.umd.edu>, cgs@umd5.umd.edu (Chris Sylvain) writes:
> < If you want to sell on the audiophile market, you really should get a blue
> < glow in there ...
> 
> Blue glow did you say? Try a Blue LED. ... Don't laugh, it's a REAL product
> looking for a market. Needs about 3.5V across it. It's made from silicon
> nitride, and is available in small quantities. They're more a curiousity
> than anything else, as no one has come upon a good reason for needing a
> Blue LED. The company that makes them (silicon nitride is really tough
> stuff; hard to work with) is Japanese.. Masushita (sp?), if I'm remembering
> the name correctly.

	There are off-the-shelf blue LED's available from Siemens Components,
Optoelectronics Div. (who absorbed Litronix, formerly a major optoelectronics
manufacturer).
	The Siemens P/N is LDB5410, and the illumination is blue at a
wavelength of ~ 480 nm.  The lamp is in a T1-3/4 package.  The Vf is close
to 4.0 volts.  The fabrication technology is silicon carbide.
	We have used these LED's as an internal light source in some
scientific instruments for quite some time.  They look neat as panel
lamps, but that's not the reason why we use them. 
	You can buy them through Hamilton-Avnet.  So, now y'all can be the
first on your block with blue LED's... :-)

<>  Larry Lippman @ Recognition Research Corp., Clarence, New York
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