LED digital tube detection device ----- LED Detector

LED digital tube detection device, LED detector Keywords: LED digital tube detection device LED digital tube detection device LED Digital Tube is a semiconductor light emitting device that displays numbers and symbols, which has been widely used in digital instrumentation instruments and electrical equipment. The LED is composed of the paragraph code of the light emitting diode. It is the most commonly used LED, and there are 8 light emitting diodes inside, and the seven light-emitting diodes constitute a "8" word, and the code of each segment is A, B, and C, respectively. , D, E, F, G, and another light emitting diode is a decimal point below the right. The code is DP. The LED can display any numbers and decimal points in 0-9, and the outer shape is shown in Figure 1. This digital tube internal structure has a common cathode and a common anode. Fig. 2 is a common cathode method, and it lights up when an anode of a light-emitting tube is high. Figure 3 is a common anode connection method. When the cathode of a light tube is low, it lights up. Pins 3 and 8 (internally connected) is a power supply, a common cathode connection, the power supply "-" is required, and the "ten" terminal is required when the ambient pick is required. One detection device (circuit is shown in Figure 4), the above-described digital tube is detected, and the S is the selection switch, the switch up is measured by the common anode digital tube, and the mortem digital tube is measured. R is a current limiting resistor, which is to limit the current (no more than 1oma) flowing through the luminescent tube to avoid excessive damage to the digital tube. Before the detection, the position of S can be selected according to the type of the digital tube, and then insert the digital tube into the tube, the tube is used to modify the IC-specific socket, that is, according to the shape, size, the number of pins, the number of pins, and the number of arrangements according to the number of the number, the number of pins. Comparable. Simple and fast. Wiring the socket on the printed circuit board, which is very convenient, and then press the button SB, and the intact digital tube should be displayed "8" and the decimal point is light at the same time. Depending on the display of the digital tube, it can be judged to determine whether its good or bad intensity of different strokes is consistent. If the digital tube does not display the "8" word break (a stroke cannot be displayed) or the decimal point is not bright, it indicates that the internal corresponding luminous tube is damaged, and the digital tube cannot be used.

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