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| Screws and spacers (see [build notes](build.md)) | | J3, J4, J5 | 3 | 10uF | Polarized capacitor | | | | | R8, R10, R12 | 3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14

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