Shenzhen Integrity electronic Co. Ltd.

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The company sold all kinds of IC integrated circuit, diode and audion, inductance capacitance resistance, crystal, led, various kinds of switch, Fuse, Relay, potentiometer,pin headers and sockets, Connector, modules, and a variety of plugins and so on.

Specializes in providing a full set of order services.

The company has long-term sales experience, client paramountcy, To provide customers with quality products!
The company aims: quality products, reasonable prices, fast delivery, service-oriented development concept. to provide most to client with satisfactory service redounding upon, connive development and establish the long-term cooperation!

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

These are single LED computing, such as N satellites simultaneously lit LED, multiply by N

The following is an example of a common LED drive circuit (not an absolute prohibition limiting resistor test!!Burn themselves!!)