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What i'm trying to make is a Table tennis server that uses compressed air. So the two electrical components so far are going to be two solenoids that will 1) close/open a door to release a ball and 2) Another solenoid that will close/open a valve linked to a regulator, to let the air flow out and propel the ball. Thinking about it, the interval's would be the same, but the there would have to be a lag between when the 2nd solenoid goes off and when the first goes off. I'm really not looking too spend much beyond...$5...I was hoping there might be some sort of timer signaling I could use...again, I'm really new at circuitry building, so this help is very much appreciated
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