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BackUser (55 "User.6" user (56 "User.7" user (57 "User.8" user (58 "User.9" user Component Count: 76 Refs C2, C5, C6, C8, C9 | 5 | 22k | Resistor | | | | | R9, R11, R13 | 3 | A1M | **Potentiometer, 9 mm vertical board mount OR: | | | | | J6, J10, J11 | 1 | 10 nF | Unpolarized capacitor | | | | | | U2 | 1 | TL074 | Quad operational amplifier, DIP-14"/>