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| 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | | L1 | 1 | 100k | Resistor | | | | | C12 | 3 | 100R | Resistor | | C7, C11 | 3 | 22k | Resistor | | C1 | 1 | 1uF | Film capacitor | | | U2 | 1 | B10k | **Potentiometer, 9 mm or 16 mm vertical board mount | | R15, R20, R22 | 2 pin Molex connector 2.54 mm spacing | Tayda | A-157 | | | | | U3 | 1 | 1 | SW_SPDT | Switch, dual pole triple.

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