Looking for a specific LED
hilpert at cs.ubc.ca
Sun Nov 29 18:31:03 CST 2009
Dave McGuire wrote:
> On Nov 29, 2009, at 7:06 PM, Brent Hilpert wrote:
> >> I've been looking for an early LED.
> >> It is a visible red light with a gold base.
> >> I've seen many IR ones with gold bases
> >> but not the visible red ones. I believe
> >> the base was standard in the older early
> >> ones. If anyone has a scrap board with these
> >> on it, I'd love to have one.
> > Like these?:
> > http://www3.telus.net/~bhilpert/tmp/earlyLED.jpg
> > Clear lens, lights up as just a little red dot.
> > Stamped around the base is "842","M" & "701".
> Monsanto MV2s. Beautiful devices.
(Minor correction to my own msg: "1842" instead of "842".
Probably the IBM part number.)
Are they so unique to id them as MV2s?, I think HP was using a similar package.
Yes, they are very pretty, as a device. The die is clearly visible looking
through the lens and it looks so perfect when lit up. As an indicator lamp,
though, they are pretty subtle, the photo exposure makes it looks brighter and
more visible than it is.
The funny thing about the exerciser is that, IIRC, it was manufactured a few
years after much better indicator LEDs were available.
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