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5 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) | | J3, J4, J5 | 3 | A1M | Potentiometer | | J2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | 14 pin DIP socket .

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