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| TL074 | Quad operational amplifier, DIP-14 | | | | | | Tayda | A-157 | | | | | S1 | 1 | B10k | **Potentiometer, 9 mm vertical board mount | | | | Tayda | A-559 | | Screws, nuts, and spacers (see [build notes](build.md | | S3 | 1 | SW_Push | Push.

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