Quote Originally Posted by Tom View Post
I hadn't thought of using RJ45s for signals - neat idea, and shielding already built in... What current and voltage are they good up to?
Not a lot, I do occasionally take liberties and they haven't let me down yet :naughty:

With this board I do feed 5 volts out on an RJ45 to drive the pendant. A bunch of pull ups and a GAL22V10. It was either a logic array or only 7 buttons. I want a lot of buttons.

One component is worth a mention, a lucky find, RS part number 249-050

The board was getting cluttered with clamp diodes, the DALC208 has 8 low capacitance diodes in a dinky 6 pin smt pack. You feed it power, ground and 4 inputs that may need clamping. A real space saver, I used 6 of them