After 10 years I can't recall if my Hickok Cardmatic LS-15874-L2 or
AN/USM-118A or B cards were ever returned or what. My remainder set is not
compplete and I wonder if anyone has a set or partial set for sale. I'd
also like to know if anyone has figured out an economical way to duplicate
them at reasonable cost? Did Hickok make them or a contractor, anyone from
Ceveland know?
On another tangent I wonder if anyone knows of any solenoids that are
small enough to install on 0.25 inch spacing. With 185 of these, using
extended matrix switch pins one could control the switching with a PC. I
wonder if anyone recalls seeing some device that uses small solenoids that
are small enough and cheap enough to homebrew a matrix. I know that this
plus more has already been accomplished with relays but at $1000.00 the mod
is unjustifiable for me.
Another alternative would be to have a "crossbar" of 11 by 17 rods or
slats with each one driven by a solenoid, requiring the a row and column
solenoid to be driven to select a pin. Having a solenoid at each end of the
rod might balance the operation. This would require 28 solenoids or double
that if one is needed at each end. These could be spaced on 1/2 inch
centers by staggering.
If anyone has a better idea please me know but the best would be to find
an orphaned set of cards.

73
hank wd5jfr