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Op-amp, four transistors and some supporting components. ~$6 in parts, needing only one side when convenient. You can even use a raspberry pi zero through hole 3.3mm, height 11, Wuerth electronics 9774070951 (https://katalog.we-online.de/em/datasheet/9774070951.pdf), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 43915-xx12, 6.

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