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** Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | | | | U3 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | U2 | 1 | 10nF | Unpolarized capacitor | Tayda | A-4349 | | Tayda | A-2939 | | R31 | 5 | 100nF | Unpolarized capacitor | | | | S3 | 1 | B10k | Potentiometer | | | J2 | 1 C10, C14 too small for a single 0.75 mm² wires, reinforced insulation, conductor diameter 0.9mm, outer diameter 2.7mm.

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