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| U2 | 1 | B10k | **Potentiometer, 16 mm vertical board mount | | R3, R7 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 KK254 Molex connector | | | | | | | | J3 | 1 | 3_pin_Molex_connector | 3 | A1M | **Potentiometer, 16 mm vertical board mount OR: **Potentiometer, 16 mm vertical board mount OR: | | Q1, Q2, Q3 | 3 | A1M | Potentiometer | | | C10 | 1 | SW_SPDT | Switch, triple pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Audio Jack, 2 Poles (Mono / TS)"/> Audio Jack, 2 Poles (Mono / TS *(optional) SIP socket, 2.54 mm, 1x7 | | | | J7, J8, J9 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 2 pin Molex.

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