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Screws and spacers (see [build notes](build.md)) | | R1, R2 | 2 | 10k | Resistor | | | | | R16, R17, R19, R20 **Potentiometer, 9 mm vertical board mount OR: | | J4 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14"/>

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