2 Dec
2009
2 Dec
'09
7:33 a.m.
On Nov 29, 2009, at 8:50 PM, Brent Hilpert wrote:
I have a handful of MV2s from my childhood days. I've never seen
another LED quite like them. There wasn't a whole lot of package
standardization (some, but not much) for LEDs in those days.
This page suggests they were from HP, the 1842 part of the number
matches.
http://www.decadecounter.com/vta/tubepage.php?item=39&user=0
http://www.decadecounter.com/vta/articleview.php?item=525
I agree; that stamped number cannot be a coincidence.
> 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. The top contact on the ones I have is the star as
shown there,
rather than the
simple circle of the MV2.
Something similar also shows up in the 1976 HP Optoelectronics
databook.
Excellent. This suggests that the small handful of these
components that I have are in fact a mix of HP 1842-7329 and
Monsanto MV2 LEDs! I have about 50/50 with and without that "star"
top contact.
The MV2 is further down the page; looks the MV2 is
more significant
historically.
Also for the MV2: http://ledmuseum.home.att.net/1960.htm
That is a fantastic web site...I lost several hours to it
yesterday. Further down that page, the 3L341V (which is almost as
aesthetically pleasing to me as the MV2!) is an LED that I have
several of; I bought them from a surplus dealer a few years ago. I
think I have about twenty of them. They're really great looking
LEDs. I also have a few of the Western Electric dual-chip LEDs that
are a bit further down.
-Dave
--
Dave McGuire
Port Charlotte, FL