2Pcs 5 inch 7 segment Red Displays Digital Tube 10PIN Common cathode LED 105*140*15.8mm 1.8 public feet | Освещение

2Pcs 5 inch 7 segment Red Displays Digital Tube 10PIN Common cathode LED 105*140*15.8mm 1.8 public feet | Освещение

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Dot matrix module, LED Segment Displays, flat tubes are regularly arranged LED (light emitting diode) products, common colors are red, yellow and green, orange, blue, white and so are several.

LED\'s normal operating current is generally 1mA-20mA, current increases brightness higher, depending on the brightness of the needs, the current value should be in this range.

Different colors of the forward voltage drop (Commonly expressed VF) Different,red, yellow and green, orange is about 1.8V, emerald green, blue, white, about 3.1V, LED parallel drive voltage constant. For large-size digital tube, LED is connected in series, the total voltage drop must be multiplied by the number of LED in series N, namely VF * N, the driving voltage must be greater than the total pressure drop of the LED to illuminate.

LED drive current limiting resistor should be added to prevent burn devices, the current limiting resistor R values determined by the following formula: R = (VCC-VF * N) / I, where VCC supply voltage, VF is LED voltage drop, N is the LED series number, I is the set operating current (units a, 1A = 1000MA), if VCC = 5V, VF = 1.8V, N = 1, I = 10MA, substituting the resistance value can be calculated as 320Ω desirable standard resistance 330Ω, such as Blu-ray is VF = 3.1V, get into R = 190Ω. Please actual parameters calculated according to the formula above operating voltage and current needs.

LED power PLED = VF * N * I, of the power limiting resistor is PR = I * I * R, corresponding to the above examples the PLED = 1.8 * 1 * 10mA = 18mW, PR = 10mA * 10mA * 330Ω = 33mW

Thesearesingle LEDcomputing, such asNsatellitessimultaneously litLED,multiply byN

The following isan example ofa commonLEDdrive circuit(not an absolute prohibitionlimiting resistortest!!Burnthemselves!!)