Hi guys. I know bugger-all about designing circuits and could do with your help. I'm making a pneumatic bazooka to fire baseballs for my son to practice hitting. The commercial unit (Zooka) has a microprocessor for all sorts of controls. The thing I want to replicate is the count down to the firing of the ball. The sequence is, for the first 3 seconds an LED and a buzzer is momentarily activated each second or there abouts). At the fourth second a solenoid is activated to open the valve (irrigation type) and the bazooka fires. Essentially: beep,,,beep,,,beep,,,Bang. So it's really a count down circuit I guess. It would be powered by a 12V battery. The solenoids are usually 24v. Would the 12v car battery be sufficient to operate the solenoid? I've Googled for hours and been to electronics shops without much luck. So I need some help. Does anyone have some ideas? Thanks in advance.