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| Screws and spacers (see [build notes](build.md | | J1 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14 | | | | | | | | | | R4, R12, R13 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS) | | C1 | 1 .

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