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BackR20 **Potentiometer, 9 mm vertical board mount | | Tayda | A-804 | | S3 | 1 | 10 uF | Unpolarized capacitor | | | | Screws and spacers (see [build notes](build.md)) | | R3, R21 | 2 pin Molex header | | | | S2 | 1 | 10 nF | Unpolarized capacitor | | | J7 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/>