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Q3, Q4, Q5 | 5 | 2N3904 | Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm or 16 mm vertical board mount. Only 16 mm vertical board mount OR: | | | | | | | R8, R10, R12 | 3 | A1M | Potentiometer | | Taydaa | A-4755 | | R15, R20, R22 | 3 | 10uF | Electrolytic capacitor | | | | J3, J4, J5 | 3 | A1M | Potentiometer | | Tayda | A-826 | | Tayda | A-805 | | | | | | Tayda | A-3486 or A-3487\*\*\* | | R31 | 1 | LM358 .

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