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| 100k | Resistor | | Q1, Q2, Q3 | 3 | A1M | **Potentiometer, 16 mm vertical board mount OR: | | | | | S3 | 1 | Conn_01x10 | Pin socket, 2.54 mm, 1x4 Pin header, 2.54 mm, 1x2 (see [build notes](build.md)) | | J9 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14"/>

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