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BackBattery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D508.PDF battery CR-3032 coin cell vertical battery CR-2025 coin cell vertical Panasonic CR-3032/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D508.PDF battery CR-3032 coin cell vertical Panasonic CR-1632-V1AN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D464.PDF battery CR-1632 coin cell battery holder, Keystone P/N 2462, https://www.keyelco.com/product-pdf.cfm?p=1027 1xAAA Battery Holder, 2479, Battery Type 3xAAA Keystone Battery Holder (http://www.memoryprotectiondevices.com/datasheets/BK-18650-PC2-datasheet.pdf Keystone Battery Holder (http://www.memoryprotectiondevices.com/datasheets/BK-18650-PC2-datasheet.pdf Keystone Battery Holder, 2479, Battery Type C Receptacle, GCT, 16P, top mounted, horizontal, 5A: https://gct.co/files/drawings/usb4105.pdf USB C Type-C USB3 receptacle SMD USB Micro-B Receptacle SMD USB 2.0 Type C Receptacle, GCT, power-only, 6P, top mounted, horizontal, 3A: https://gct.co/files/drawings/usb4135.pdf USB C Type-C Receptacle Through-hole Right angle USB type A, right angle, http://spec_sheets.e-switch.com/specs/P040170.pdf Switch, single pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14 | | | C1, C11, C12 | 2 | 1N5817 | Schottky diode | | R4, R6, R7, R30, R31 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>