1's Brick1000 onRelay self fireRelay
0 onRelay self decrementPrintCount 1
0 onPrintUnderflow 10s decrementPrintCount 1
10's Brick
0 onPrintUnderflow self spawnExplosion tankShell BlahBlah
Simple....just needs a switch activation
I've made more complex ones with Cut-Red/Blue Wire, preventing accelerating timer be multi clicking, etc. But I hate explaining that. All I can say there is make a separate brick that, onRelay, resets all others.