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| Screws, nuts, and spacers (see [build notes](build.md)) | | C7, C12, C13 | 3 | 4.7k | Resistor | | | C10 | 1 | LED | Light emitting diode | | | Tayda | A-004 | | R25, R27, R29 | 3 | A1M | Potentiometer | | | | | J9 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | Tayda | A-826 | | J2 | 1 | 10R | Resistor | | | Q1, Q2, Q3 | 3 | 1 | B20k | Potentiometer | | | | Tayda | A-553 | | J2 | 1 | B20k | Potentiometer | | | | | | Tayda | A-1121 | | | C13 | 3 | 1k | Resistor | | | | | Tayda | A-962 | | | Tayda | A-559 | | | R8, R10, R12 | 3 | A1M | Potentiometer | | | | R8, R10, R12 | 3 | 100R | Resistor | | D1, D2 | 2 | 1N5817 | Schottky diode | .

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