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| S3 | 1 | Conn_01x04 | Pin socket, 2.54 mm, 1x10 Pin header, 2.54 mm, 1x10 | | | | | | S2 | 1 | AudioJack2_SwitchT | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) Audio Jack, 2 Poles (Mono / TS *(optional) SIP socket, 2.54 mm, 1x10 Pin socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | R9, R11, R13 | 3 | 100R | Resistor | | D3, D4, D5, D8, D9, D10 | 8 | 1N4148 | 100V.

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