Quoted from pinkid:Good news !! Got another S&T board and I now have speech/sound !! This project is coming along nicely. My "doodlebug" device w/the ball under the playfield that is activated w/the Doomsday bonus isn't working. How does this thing work anyway?? Haven't tinkered w/it at all. Is there a solenoid that drives it???
There's a magnet coil and a (logic) switch underneath. The coil is turned on and the ball is pulled towards the centre hitting the switch, and the game turns off the coil. The ball keeps rolling up to the top of the chamber and starts down. When the switch is hit again, the coil is turned on again and so on and so on.