Odd Meas. Units

From: jpero_at_pop.cgocable.net <(jpero_at_pop.cgocable.net)>
Date: Mon Oct 19 20:02:32 1998

> Date: Mon, 19 Oct 1998 23:38:24 -0400
> Reply-to: classiccmp_at_u.washington.edu
> From: CLASSICCMP_at_trailing-edge.com
> To: "Discussion re-collecting of classic computers" <classiccmp_at_u.washington.edu>
> Subject: Re: Odd Meas. Units
> X-To: classiccmp_at_u.WASHINGTON.EDU

> > Wait...all matter resists current, and all matter can be forced to
> > emit light, so any item is a 'Light-emmitting resistor'.
>
> One of the early April 1 issues of BYTE (1975? More likely 1976)
> has the specs for a "noise emitting diode". If I remember the
> definition: "When connected across high voltage, makes a large
> noise (once)."
>
> When did LED's begin wandering out of the solid state physics labs
> and into commercial products? I remember individual LED's in the
> very early 70's, and by the mid-70's they were everywhere in the
> form of 7-segment displays.
>
> Is there some landmark "first commercial use" of the classic T1-3/4
> individual LED package that's so common today? Were there early
> LED packages that just completely disappeared?

Remember that very well bec I had several old styles and standard
styles. Current styles came into being before '80's I think.
Old ones looks weird in type of epoxy and looks darker and most used
round leads, one thick lead and thin lead, one of them in center and
one on radial.

Also they usually doesn't glow as bright and quality for those old
LED's.

Now there are newer styles and most recent is super bright blue LED's
and white LED's (using 3 matched up LED in 1 package (Proton sells
these in keychain lighters.) and oddball shapes like ovals, square
triangles etc, some LED mounted the die on the side without the
focusing cone.

Oh yeah, SMD leds of all kinds and some draw around 2mA but decent
enough for brightness. Got one that does draw that current less than
that?

All LED's does fade with use, low quality ones quickest.

Jason D.

>
> Tim.
 
email: jpero_at_cgocable.net
Pero, Jason D.
Received on Mon Oct 19 1998 - 20:02:32 BST