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4520 - 8bit binary counter/clock divider. Can trigger on both clock signal edges (determined by which input is used).
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234 - Sync clock divider, one pulse out for every 2,3 or 4 in.
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Trigger - small module with 2x gate rising edge detectors, 2x inverters with button. Additional ORed output for the two edge detector outputs.
Panels and PCBs licensed cc-by-sa.