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BackA-004 4 Knobs Screws, nuts, and spacers (see build notes) 1 SIP socket, 2.54 mm, 1x4 | | | U3 | 1 README.md | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/>