1) I was thinking about an automatic power window controller. How do these work/are they easy to build? How does the controller know that the window is up?
2) Turbo-timer, are they just a 30 second time delay relay? If so can someone provide a basic circuit, or maybe a good 555 tutorial.. I've seen some shockers which weren't helpful and these put me off.
3) Blow-off valves - (I assume I'll be flamed for this one) Can I somehow simulate this sound through a speaker using some circuit??