Hi panic mode,
That circuit looks very interesting,
but i can't quite follow it,
maybe theres some missing ?
It sort of reminds me of that circuit i made years ago,
to match a set of teletype letter-solenoids with their
keys on a keyboard, that was just resistors and
capacitors.
But for the teletype it only had to operate the letter-
solenoids briefly, just for about half a second or less
as i recall, so the circuit i came up with for that
would not do for this.
Basically it was the same as the one in the first post,
but i had caps where egg0900 has batteries, they were
fed by resistors from the supply, pressing a key
discharged a cap into a letter solenoid.
8x8 keyboard, 8x8 solenoid board, the hardest thing was
the wiring!
Please give some explanatory notes on that diagram,
i am finding it confusing !
John