bringing up an 8f...

From: CLASSICCMP_at_trailing-edge.com <(CLASSICCMP_at_trailing-edge.com)>
Date: Mon Apr 5 18:59:24 1999

>On an interesting note is the availability of "white" LEDs (actually R, G,
>and B leds all wired together in the same case).

*Most* of the white LED's currently on the market are GaN (blue) LED's that
illuminate a white-producing phosphor. The chromaticity indices of the
resulting light is markedly different than you get from mixing R,
G, and B. (Though this probably doesn't matter to anyone for this
particular application...)

> This leaves open the
>possibility of replacing lamps with white LEDs continuing to keep the 8/e
>in service as it was intended. (I also scavenge wheat lamps when I see 'em!

It requires some small modifications, most noticably some way of dealing
with the pre-heat current (usually done with a shunting resistor across
the LED, though I have also seen schemes where a Zener or lifting a leg
of the pre-heat resistor is done.)

-- 
 Tim Shoppa                        Email: shoppa_at_trailing-edge.com
 Trailing Edge Technology          WWW:   http://www.trailing-edge.com/
 7328 Bradley Blvd		   Voice: 301-767-5917
 Bethesda, MD, USA 20817           Fax:   301-767-5927
Received on Mon Apr 05 1999 - 18:59:24 BST

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