Minecraft wiki entry for Pulse, associated text: A cheap, noisy option to output 1 out of 2n pulses (1 in 2, 4, 8, 16, 32 etc.), indefinitely extensible - each next module (repeater-piston pair) doubling the divider. Depends on the Java Edition's quirk of sticky pistons 'spitting out' their payload when activated with 1-tick pulses and quasi-connectivity. If the input pulse is longer than 1 tick, the first module will act as pulse limiter instead of a 'memory cell', so the only modification needed for this sort of input is adding one more module vs 1-ticked input (e.g. from an observer). The output pulse can be extended up to 4 ticks by increasing the tick count on the last repeater.