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BackR13 | 3 | 10k | Resistor | | Screws and spacers (see build notes) 1 SIP socket, 2.54 mm, 1x4 | | | U2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>
R13 | 3 | 10k | Resistor | | Screws and spacers (see build notes) 1 SIP socket, 2.54 mm, 1x4 | | | U2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>