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2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | U3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | | R3, R7 | 3 | 1k | Resistor | | U2 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x7 Pin socket, 2.54 mm, 1x7 | | | | Screws and spacers (see build notes) 1 SIP socket, 2.54 mm, 1x2 (see.

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