The internal structure of common digital tubes is roughly divided into two categories, one is a common cathode, and the other is a common anode. The common yin is to connect the negative poles of all the LEDs inside the digital tube together, see Figure a below. Gongyang is to connect the positive poles of all the LEDs inside the digital tube, see Figure b below. Each field of the digital tube is actually a light-emitting diode.
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