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| R21, R22, R23 | 3 | A1M | \*\*Potentiometer, 9 mm or 16 mm vertical board mount OR: | | Screws and spacers (see [build notes](build.md)) | | | R30 | 1 | TL074 | Quad operational amplifier, DIP-14"/> Base-T, AutoMDIX, https://belfuse.com/resources/drawings/magneticsolutions/dr-mag-si-60062-f.pdf 1 Port RJ45.

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