Here is a new redstone timing device that offers great flexibility and range in a very compact space. The idea is to ping pong items between 2 hoppers connected together and controlled by a RS Nor latch.
Sorry for the math blabbering. The key thing to remember is that each item you add increases the delay by 0.7 seconds, or 0.35 seconds if detecting half cycles. You can have a maximum of 320 items in the hopper combo.
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