figure 14 (a) below. if the digital form for the common cathode, which should drive level or source emitter output circuit, as shown in figure 14 (b) below. picture this subject as follows: for example, domestic ttl integrated circuits ct1049, ct4049 for the open collector driver circuit decoding the form of seven-segment-shaped; and cmos integrated circuits for the source output cc4511 seven segment latch decoder driver circuit. (2) control led driver stage control circuit (also known as drive circuit) has a static type and dynamic type categories. ① static drive: the static drivers, also known as the dc drive.
display boards at present, some models of transistor hfe multimeter scale with measurement lines and test sockets, can easily measure the magnification of the transistor. first multimeter function switch to block, the range switch to the adj position, the red, black table pen shorted, the zero adjustment knob, so that the multimeter pointer indicates zero, and then switch to the hfe position range and make the two short then the table t to separate the transistor under test into the test socket, you can read from the pipe line hfe scale magnification.
custom neon signsr & d and quality testing in the laboratory equipment, basically meet the domestic demand for led product development in general. domestic instruments tend to have relatively large price advantage, and only a fraction of the imported equipment, which many domestic small and medium enterprises led products that improve the quality of the early play a positive role. however, due to technological level of manufacturing of certain equipment and the knowledge gap between the led measurement standards so that all manufacturers are often among the instruments to measure the results of obvious differences.
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