No – you can’t just plug a 12 V supply into a Raspberry Pi 3 B+. The Pi’s power‑input circuitry is designed for a 5 V supply (via the micro‑USB or the 5 V pin on the GPIO header). A 12 V source will over‑voltage the board and damage it. If you only have a 12 V supply, you’ll need to drop it to 5 V with a DC‑DC converter (or use a proper 5 V power supply).
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