I've only worked directly for one Manufacturing Engineer and he was
happy to let me design circuits and otherwise do as I pleased.
But yes, they can all become very defensive and territorial. Sometimes
after the hardware is functional I work for the software group as a
test engineer. Another can of worms opened.
[ ... ]
How many here have ever heard of a "binistor"? A 4-pin bistable
device which apparently never took off in the market. It was a
four-layer device (like a SCR -- except that it had another pin to allow
turning it off.
IIRC, Transitron gave it the designation 3N21. I could look it
up in the old Transitron data book -- but I don't know where that is at
the moment. :-)
On Sun, 10 Jan 2010 10:42:24 -0500, the infamous Spehro Pefhany
scrawled the following:
Are LASCRs still available? They'd be great for a "Hey, the mailman's
here! alarm. We have a local lady who checks everyone's mailbox at
times, too. They'd catch her in the act.
they're good for flash slaves, too.
Growing old is mandatory; growing up is optional.
and Possum(tm) Handy Pouches NOW AVAILABLE!
O.K. Germanium means that I have given the wrong part number.
It was a silicon device. I wonder what those 3N devices were, how they
earned the leading 3 instead of 2. Transitron used it as a count of
junctions (e.g. one less than the number of leads.
The xNyy pattern is from a JAN standard, if I recall. I think that the
x is one less than the number of terminals, the then assumption being
that one must have at least two terminals. I don't think that the
number of junctions was considered, the intent being to treat the device
as a black box.
I would have guessed that 3N21 was an optocoupler, or a SCR with all
four layers connected. However, it seems to be an obsolete transistor
type made by Sylvania and Western Electric:
. However, it turns
out to be a Germanium switching transistor: