Received something interesting today.
It's a piece of an HP signal generator (doesn't work standalone). And it has a very unique keypad.
The switching mechanism is not Hall Effect, Contact Based, Capactive, or Optical.
It's been described as a "Pulse Transformer Switch" by a friend of mine, which is apparently common in basic key switch circuits. But apparently extremely rare for keyboard switches, because I've never seen or even heard of one till now!
I actually have full schematics of the beast, so I should be able to make it work eventually (the keypad that is).
Anyways, time for pics!
There's the transformer for the keypad.
Gah my eyes, burning, too much gold...
Microswitches by Microswitch, who'd a thunk it
Yes, those are plastic screws...