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Back4 Knobs Screws, nuts, and spacers (see [build notes](build.md)) | | | C6, C7, C8, C9 Schottky Barrier Rectifier Diode, DO-41 | | | | | | | L1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>
4 Knobs Screws, nuts, and spacers (see [build notes](build.md)) | | | C6, C7, C8, C9 Schottky Barrier Rectifier Diode, DO-41 | | | | | | | L1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>