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Throw | | J9 | 3 | 4.7k | Resistor | | | C6, C7, C8, C9 | 1 | B20k | Potentiometer | | L1 | 1 nF | Unpolarized capacitor | | | | | | | | Screws, nuts, and spacers (see [build notes](build.md)) | | | U2 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14 | | | | R20, R22 | 3 | A1M | Potentiometer | | Tayda | A-553 | .

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