Quote Originally Posted by Rambozo View Post
A lot of digital logic chips are tri-state designs, so good practice is to use appropriate pull-up or pull-down resistors to control the floated state.
Ugh. What a PITA to have to install resistors on all the un-used pins. I'm inclined to trash the 4066 altogether and just go with an NO relay with built-in opto-isolator. It's really the right thing to use. I'm just using the 4066 because I had it on hand.

Meh. I guess I could just install one resistor and bridge all the pins through it to ground.