Identify the same end of the coil

76. Identify the identical terminal of the coil [url=../Upload/200552716523641.jpg] If you need to know the identical terminal of a transformer's primary and secondary coils, you can use an identifier composed of thyristors and other components for identification. The circuit is shown in the figure, which is designed based on the controllable conduction conditions of silicon. The moment the power is turned on, the left negative and right positive induced potentials will be generated on the primary coil L1. If 1 and 3 are terminals with the same name, then terminal 3 will also sense a positive potential at the same time. These two positive potentials are added to the controllable On the silicon anode and control stage, the thyristor is turned on and the light-emitting diode shines. On the contrary, if 1 and 3 are different terminals, the control electrode of the thyristor will get a negative potential, and the light-emitting diode will not be able to light up.