Hi I have taken on the project of building a starting gate for a local kid. I am a machinist not a electronics tech. I have been reading on similar timing circuits and thinking Im in way over my head, but it has sparked an interest. The basic plan is powered by a car batter, sequence of operation 30 second delay at 0sec turns off an LED and starts a random up to 10 second delay at which time it activates a soleniod for just a split second opening the gate. As I said this has sparked an interst so I would like to learn what Im doin and not just put pieces together. Thanks