Great info, Quantalume. Thanks. I suspected these guys needed AC of some sort, like a transformer, but they're smarter than that fortunately! Know if they still need diodes for an NKRO matrix? I hear my Honeywell has poor rollover, but I don't know if this is the matrix or controller's fault.quantalume wrote:Ah, very nice. I once had a similar Honeywell keyboard, but somewhat smaller and without any encoding circuitry. Sadly, it's long gone.Muirium wrote:Ah, Honeywells. I have a few of those, too, but they're all in this keyboard:
http://deskthority.net/photos-videos-f8 ... t6296.html
Two of the four pins go to the power supply, and the other two pins are open collector outputs, like this:How do you use them, electrically speaking?
The pair of open collector outputs were essentially an open circuit when the key wasn't pressed. so you could wire them together in standard matrix fashion.I doubt I have enough to supply all interested parties, but what would you think about creating a roving package of unusual and/or out-of-production switches? I could contribute one assembled and one disassembled Honeywell switch, like this one:And do you fancy sharing a few spares with the community? I know plenty of people who'd love to try one of this legendary smooth linear switch.
One neat feature of this design was the self-adhesive, double-sided tape on the bottom plate. This allowed one to stick the switch in place while the PCB was turned over and soldered.
I've been adding weird old switches of my own to the sample box I bought from Mr. Interface last year. Perhaps I should get into the touring racket with you!
) matrices, as you end up with a conductive loop which can short-circuit some keys and make them appear live.
Thank you kind sir, quantalume is a gentleman and a scholar!
