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Back| R14, R15, R18 | 3 | 1nF | Unpolarized capacitor | | | | | S3 | 1 | AudioJack2_SwitchT | Audio Jack, 2 Poles (Mono / TS *(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | | R31 | 1 | SW_Push | Push button switch, generic, symbol, four pins D Push button switch, generic, two pins | | L1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | | S3 | 1 | AudioJack2_SwitchT | Audio Jack, 2 Poles (Mono / TS)"/>