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BackSmall Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm pots, you're on your own! * The 16 mm vertical board mount | | | | | R24, R26, R28 | 3 | 10uF | Polarized capacitor | | | | R9, R11, R13 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92