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[rtrqdc69]

test circuit shown in figure 4, a stable output current for led control device when the input voltage at 92% to 106% range changes, the output current and is equipped with a led rated current than the deviation is less than lusm10%. menu board not have a stable output for led current control device, when the input voltage rating, the output current and is equipped with the led's operating current than the bias should be less than 10%.
the establishment of the project is to install the unit in order to provide the necessary electrical parameters to facilitate the process of installing power distribution design. as longas the power used, ammeter and voltmeter can measure the rms,led billboard thepower factor values can be measured by λ = p / ui obtained, where p is the power table shows the total active power, u is the supply voltage , i for the supply current.
at the same time designers no longer have the headache for theimpedance matching; 2.3, digital optical transmitter can be modulated drive circuit. digital baseband signal as long as the line through a simple code,led signboard you can directly drive optical transmitter. now, the price of fiber optic devices has dropped significantly compared with the previous, and future price increases as the cable and fiber optic devices further decline in prices, people will no longer select the first optical fiber, regardless of price.