29 Feb
2008
29 Feb
'08
9:33 p.m.
On Fri, Feb 29, 2008 at 11:45:55PM +0000, Tony Duell wrote:
I have something like that with me here in my bag-o-parts... approx 20mm
by 30mm, with a 2mm-thick body made of a rough, dark ceramic, with a 1mm
thick glass top. It's a 2.5 digit display with + and -. All the leads
come through the back of the package in what appears to be a straight-
through fashion (making it easy to figure out how to hook it up).
There is a vendor and part number etched on the face: Sperry SP-738.
I've never tried to hook it up to anything, and have no idea what
voltages it might want. It's a shame it's only 2.5 digits; if it
were 3.5 digits, it might make an interesting 12-hour clock face.
Not sure what I'd need to do that swings from -199 to +199 off the
top of my head.
-ethan
--
Ethan Dicks, A-333-S Current South Pole Weather at 1-Mar-2008 at 05:20 Z
South Pole Station
PSC 468 Box 400 Temp -59.6 F (-50.9 C) Windchill -94.4 F (-70.2 C)
APO AP 96598 Wind 11.9 kts Grid 11 Barometer 687.4 mb (10350 ft)
Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html
Does anyone know when seven segment displays first appeared on the scene?
Presumably the first ones were VF, and LED came later?
There were some filament ones -- 7 long filaments in the obviosu pattern,
in an evacuated envelope. Some looked like vavles (but were generally
wire-ended), others were ina flatter package, looking a bit like an IC.