The system is self-made, divided into control module (mainly 51 microcontroller) and LED dot matrix screen, the driver chip is 138 and 595, using 8550 transistor amplification, current limiting resistor 330 ou. Baidu checked, said, 64 * 16 dot matrix screen requires 5v40A switching power supply, then this power can not be 51 SCM power supply at the same time? I forget, 64*16 dot matrix screen when all lit...
One can be used, but direct power is not recommended. You're all on the A scale. The output of the switching power supply is not very stable. Build a regulator chip.Switching power supplies do not allow him to work at full capacity. You don't have much chance to shine all the time, but it's better to keep the wattage off the threshold.
The power is too big to waste. Dynamic scanning, then, at the same time, at most is a line of full light, static scan will be 10A.SCM power directly with this can also, the problem is not, but in the power and ground between a capacitor, 100u is ok.
With red 1.6 volts LED, you're pretty much the same, and if you're using a blue 3.6 volt LED, the current is even smaller,40 Ann's power won't need to be wasted.. If the target 10, a good power supply, no water, enough, of course, the SCM is best independent power supply.
