23 Oct
2015
23 Oct
'15
8:17 a.m.
Alas, it's DPDT, not SPST.
Ooops; the ones in the PDP-11 front panels (/05, /45, /70 and almost
certainly the /40 too) are SPDT, not SPST (typing too fast, in my excitement
that these have finally been found :-).
I looked at the data sheet for the ones you found, and it's actually a sheet
for the whole series, from which it looks virtually certain that the right
ones (both pemanent and momentary contact) can be ordered from C+K. It's just
a matter of working out what the part number would be!
Noel
23 Oct
23 Oct
8:22 a.m.
On Fri, Oct 23, 2015 at 11:17 AM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
Yes. The footprint for the existing front panel PCBs are SPDT.
Alas, it's
DPDT, not SPST.
Ooops; the ones in the PDP-11 front panels (/05, /45, /70 and almost
certainly the /40 too) are SPDT, not SPST I looked at the data sheet for the ones you found, and
it's actually a sheet
for the whole series, from which it looks virtually certain that the right
ones (both pemanent and momentary contact) can be ordered from C+K. It's just
a matter of working out what the part number would be!
Part number and availability. From a quick look around, I see low
availability numbers (one part was "3 remaining" and a notice that
they would not be restocking that part).
In the larger scheme, I think it's fine to find these switches for
restoring real machines, but I think we are better off finding
alternate sources for a new design. The benefit of the "real" panel
mount switches is that if we make a replica PCB with PCB-mount, the
panel mount switches will still work, given the DEC mounting frame
(and that's another kettle of fish - I have one, and I think it's
stainless steel because it's quite "lacy" with 12mm square holes and
1mm of metal between them. That would be exciting to reproduce in a
home shop).
-ethan
3348
days inactive
3348
days old
1 comments
2 participants
participants (2)
-
ethan.dicks＠gmail.com -
jnc＠mercury.lcs.mit.edu