The pin is distinguished from the pin of the thyristor, and some can be discriminated from the shape package, and the general anode and cathode lead ratio control extremely leader length. With the shape of the shape that cannot be judged, the multimeter R × 100 or R × 1K gear can be used, and the forward and reverse resistance between the reluctable silicon is said to be measured, and when the multimeter indicates the low resistance value (the scope of hundreds of Euro to thousands of Europe At the time, the black table pen is connected to the control of the polar g, the red surface pen is connected to the cathode K, and the remaining one pin is an anode A.

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