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Back\** Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | | | | | Tayda | A-3588 | | | | J1 | 1 nF | Unpolarized capacitor | | | | | Tayda | A-4349 | | S1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14"/>