The utility model relates to an electric connector which comprises an insulation main body, a first conductive terminal, a second conductive terminal, a third conductive terminal, and a fourth conductive terminal, wherein the inner part of the insulation main body is provided with a printed circuit board, and the first conductive terminal, the third conductive terminal, the second conductive terminal and the fourth conductive terminal are electrically connected by an electronic circuit of a circuit board respectively; furthermore, the conductive terminals are welded on the circuit board, wherein the first conductive terminal and the third conductive terminal are welded on the first surface of the circuit board, and the second conductive terminal and the fourth conductive terminal are welded correspondingly on the other surface.

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