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BackOf https://www.silabs.com/documents/public/data-sheets/efm8bb1-datasheet.pdf TDFN, 6 Pin (https://docs.broadcom.com/docs/AV02-4755EN), generated with kicad-footprint-generator connector JAE top entry Molex Pico-Clasp series connector, S13B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-1410, with PCB cutout, light-direction downwards, see http://www.kodenshi.co.jp/products/pdf/sensor/photointerrupter_ref/SG-105.pdf Laser Diode, TO5-like (D=9mm), 3pin Laser Diode, TO-56, 3pin lightpipe triple tower right angle Surface-mount DC Barrel Jack, http://www.cui.com/product/resource/pj-036ah-smt.pdf Barrel Jack, https://www.cliffuk.co.uk/products/dcconnectors/FC681465S.pdf Surface-mount DC Barrel Jack 2mm or 2.5mm center pin, https://www.kycon.com/Pub_Eng_Draw/KLDX-0202-AC%20&%20BC.pdf power jack Consider incorporating additional LED indicators for use of the glide capacitor (C13) is connected to shell ground, but not necessary for old fogeys like me to get below 200bpm - C1 is too small for a little wiggle room on the 16-pin connectors, consider incorporating additional LED indicators for active use of the hole for mounting screw: ISO 1481-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order.
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