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BackR7, R30, R31 | 5 | 100nF | Unpolarized capacitor | | | 2 | 1 | 10nF | Unpolarized capacitor | | | J1 | 1 nF | Unpolarized capacitor | | | Screws and spacers (see [build notes](build.md | | S1 | 1 nF | Unpolarized capacitor | | Tayda | A-553 | | S3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92