On 18 Mar 2011, at 03:0, koolatron wrote:
However, it turns out that the SK-185 sockets that fit NL-5440As are
also rather oddball. Here's a link to some detailed photographs and
datasheet diagrams of the devils:
http://www.tube-tester.com/sites/nixie/data/soc/SK-182-burr-cha/
SK-185-burr-ch.htm
I've tried several times to generate a sane EAGLE footprint that fits
this socket, and have met with only failure. The socket has 16 pins,
which would at first blush correspond to a 17-pin ring of evenly-
spaced contacts, with one missing. That, however, is not not the case
-- each 90-degree quadrant has four contacts, and they appear to be
spaced unevenly around the circle.
A brief observation shows me that it is the engineering drawing that
is throwing your eye out and this does appear to show the quadrant
issues that you see, which would actually mean the pins were bunched
in two of the quadrants, to allow the gap as shown. The actual socket
is not quite the same, the centre line is not where shown on the
diagram, it's offset and the pins are thus equally spaced. A quick
exercise overlaying radial lines at 21.176º over the actual socket
leads me to believe the pins are equally spaced. Thus Sockulator
should be your friend here and make you a part for Eagle.
I did wonder if they did something sneaky and made the angle an
integral 21º with a wider gap, but again a quick exercise shows that
this fits worse than 21.176º.
John S
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