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Back(53 "User.4" user (54 "User.5" user (55 "User.6" user (56 "User.7" user (57 "User.8" user (58 "User.9" user Component Count: 77 Refs 3 pin connector, https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F215079%7FY1%7Fpdf%7FEnglish%7FENG_CD_215079_Y1.pdf%7F215079-4 connector TE-Connectivity Micro-MaTch female-on-board top-entry thru-hole 4 pin straight chassis connector http://www.te.com/usa-en/product-1-1478204-0.html BNC female PCB mount 4 pin, 2.0mm square SMD pads Net tie, 4 pin, 0.5mm square SMD pads Net tie, 4 pin, 2.0mm square SMD pads Net tie, 4 pin, 1.0mm round THT pads Net tie, 3 pin, 1.0mm round THT pads Laser Gaming Sensor ADNS-9800 Fiberoptic Transmitter TX, HFBR series (https://docs.broadcom.com/docs/AV02-3283EN TSL2550 ambient light sensor, i2c interface, 6-pin chipled package, http://optoelectronics.liteon.com/upload/download/DS86-2013-0004/LTR-303ALS-01_DS_V1.pdf Optoisolator with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100CY, light-direction upwards, see http://www.kodenshi.co.jp/products/pdf/sensor/photointerrupter_ref/SG-105.pdf Laser Diode, TO-3.3mm, 3pin Laser Diode, TO-38-ICut, 3pin Laser Diode, TO18-like (D=5.6mm), 3pin Laser Diode, TO-3.3mm, 3pin Laser Diode, TO-38-ICut, 3pin Laser Diode, TO-3.3mm, 3pin Laser Diode, TO-38-ICut, 3pin Laser Diode, TO-3.3mm, 3pin Laser Diode, TO-38-ICut, 3pin Laser Diode, TO5-like (D=9mm), 3pin Laser Diode, TO-56, 3pin lightpipe triple tower right angle SPDT push button (https://www.alps.com/prod/info/E/PDF/Tact/SurfaceMount/SKRT/SKRT.pdf push horizontal SPST 1P1T CK components KMR2 tactile switch D MEC 5G single pole double throw, separate symbols | | U3 | 1 | 2_pin_Molex_connector | KK254 Molex header 2.54 mm spacing | Tayda | A-1624 or A-2969 | | | | Tayda | A-3186 | | | | R4, R12, R13 | 3 | A1M | **Potentiometer, 16 mm vertical board mount | | U2 | 1 nF | Unpolarized capacitor | | | | | | | | | | J7, J8, J9 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14"/>