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\*\* Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | | | | | | J7 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14 | | C12 | 3 | 1 | 10R | Resistor | | J2 | 1 | SW_SPDT | SPDT miniature toggle switch | | | | | Knobs.

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