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| C13 | 3 | A1M | Potentiometer | | | | | | Tayda | A-1955 | | Tayda | A-804 | | U2 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | R16, R17, R19, R20 **Potentiometer, 9 mm or 16 mm vertical board mount | | | | Screws, nuts, and spacers (see [build notes](build.md.

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