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| J9 | 1 | SW_Push | Push button switch, generic, two pins | | | | | | J3 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) | | | R3, R21, R27, R28 | 4 | 47k | Resistor | | | | C1 | 1 | Conn_01x04 | Pin header, 2.54 mm, 1x2 (see [build notes](build.md | | | | | | Tayda | A-1138 | | | U2 | 1 nF | Unpolarized capacitor | | U2 .

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