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Cr1220 cr1225 1xPP3 (9V) battery holder, Memory Protection Devices P/N BC2AAPC, http://www.memoryprotectiondevices.com/datasheets/BC2AAPC-datasheet.pdf 2xAA cell battery holder, Keystone P/N 2462, https://www.keyelco.com/product-pdf.cfm?p=1027 1xAAA Battery Holder, Keystone, Plastic Case, http://www.keyelco.com/product-pdf.cfm?p=1031 AAA battery cell holder 2xAA cell battery holder, http://www.comf.com.tw/ProductDetail.asp?no=148 Keystone type 3000 coin cell retainer Keystone type 3034 coin cell cr1216 cr1220 cr1225 1xPP3 (9V) battery holder, Keystone P/N 2468, http://www.keyelco.com/product-pdf.cfm?p=1033 AAA battery holder Keystone Battery Holder 2479 Battery Type 3xAA Battery Holder SMD 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 | | S1 | 1 | B20k | Potentiometer | | | Tayda | A-159 | | | | | | | | | | | D 2 pin Molex header 2.54 mm spacing | Tayda | A-1135 | | | R15, R20, R22 | 3 | 10uF | Polarized capacitor | | Tayda | A-553 | | U2 | 1 | 1uF | Film capacitor | | | | | | | | | U1 | 1 nF | Unpolarized capacitor | Tayda | A-1121 | | | Tayda | A-1138 | | Tayda | A-4349 | | | | | Q1, Q2, Q3, Q4, Q5 | 5 | 2N3904 | Small Signal NPN Transistor, TO-92 Switch, triple pole double throw Precision Timers, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | | R30 | 1 | SW_Push | Push button switch, generic, two pins | Dailywell | PAS7B3M1CESA6-5 | Tayda | A-3186 | | U2 | 1 | 10 nF | Unpolarized capacitor | | | | | J7, J8, J9 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | R3, R21 | 2 pin Molex connector 2.54 mm spacing.

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