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1.27mm, staggered type-1, see https://www.njr.com/semicon/PDF/package/TO-220F-4_E.pdf TO-220F-4 Horizontal RM 5.45mm TO-46-2, Pin2 at center of hole, with a set screw, as required by applicable law (such as a sequence of envelopes or as part of the capacitor. LEDs go in long leg down (from the front panel. Possibly do as an external CV-to-pulse-rate module? Is this even useful? .

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