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BackMm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, CR1220 battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder (http://www.memoryprotectiondevices.com/datasheets/BK-18650-PC2-datasheet.pdf Keystone Battery Holder BH-331P Battery Type 3xAAA Keystone Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch, https://www.e-switch.com/system/asset/product_line/data_sheet/165/TL3342.pdf SWITCH SMD KSA SW 4-bit rotary coded switch, through-hole, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf SPST Off-On Pushbutton, 1A, 30V, CW Industries P/N GPTS203211B, http://switches-connectors-custom.cwind.com/Asset/GPTS203211BR2.pdf SPST button switch OFF-(ON) | Dailywell | PAS6B3M1CESA3-5 or PAS6B3M1CESA2-5 | Tayda | A-4349 | | R21, R22, R23 | 3 | 4.7k | Resistor | | | | D6, D7 | 2 | 10k | Resistor | | | Tayda | A-2939 | | J2 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8