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BackSupporting components. ~$6 in parts, two tl074 op amps and otherwise a bunch of wires backwards Fix floating pin for op amp 54f1a61ba5 gets jiggy with PCB cutout, light-direction downwards, see http://www.kodenshi.co.jp/products/pdf/sensor/photointerrupter_ref/SG-105.pdf Laser Diode, TO18-like (D=5.6mm), 3pin Laser Diode, TO-38-ICut, 3pin Laser Diode, TO5-like (D=9mm), 3pin Laser Diode, TO-56, 3pin lightpipe triple tower right angle DPDT push button https://www.e-switch.com/system/asset/product_line/data_sheet/210/800U.pdf CuK miniature slide switch, OS series, SPDT, https://www.ckswitches.com/media/1428/os.pdf tactile switch http://www.ckswitches.com/media/1479/kmr2.pdf CK components KMR2 tactile switch https://cdn.sos.sk/productdata/80/f6/aabf7be6/5gth9358222.pdf Switch NKK G1xJP http://www.nkkswitches.com/pdf/gwillum.pdf SWITCH TOGGLE ILLUM SPDT NKK Switch, single pole double throw | | | | L1 | 1 | SW_DPDT_x2 | Switch, single pole double throw D Switch, three position, dual pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14"/>