Double wiring, single wire resistance is more than 2 ohms, v1 passes through v3, v2 passes through v4 (I seem to remember correctly), use short-circuit v3v4, v1v2 in series for power supply, use short-circuit v1v2, v3v4 in parallel, parallel 12v power is more than 100w, and can melt tin , multiple boards can be spliced into a large board, the specific series and parallel and power supply voltage can be selected by yourself.
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