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Description="Quad operational amplifier, DIP-14 | | | | | S3 | 1 | | | J10 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14 | | U1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | R16, R17, R19, R20 **Potentiometer, 9 mm pots, you're on your own! * The jacks, like the SPDT switch, needed a nut behind.

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