Ban phai noi ro la bi mat nguon khi co sim hay ko co sim. Neu khong co sim ma cu bat len la tat nguon thi ban phai tach het rung chuong ra roi thu lai,vi nhieu truong hop do rung chuong an dong nen may bi tat. Tiep den la kep dong ho dong va tang dien ap len mot ti, khoang 5v roi thu. Neu van bi thi hay lam phan mem. Chuc thanh cong ! neu duoc thi thanks anh em cai nha
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