Looking for a specific LED
mcguire at neurotica.com
Wed Dec 2 09:33:26 CST 2009
On Nov 29, 2009, at 8:50 PM, Brent Hilpert wrote:
>>>>> 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.
>> 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
I agree; that stamped number cannot be a coincidence.
> 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
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"
> The MV2 is further down the page; looks the MV2 is more significant
> 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.
Port Charlotte, FL
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