Ordinary light-emitting diode forward voltage drop of saturated 1.6 ~ 2.1 V, forward current of 5 ~ 20 mA. LED main parameters: 1) Absolute Maximum Ratings (1) allow power Pm: to allow the addition to the DC voltage across the LED forward current flowing through it the product of the maximum . Than this value, LED heat, damage. (2) Maximum forward DC current IFm: increase the maximum permitted positive DC current, more than this value can damage the diode. (3) The maximum reverse voltage URm: increase the maximum allowed reverse voltage exceeds this value, breakdown of light-emitting diodes may be damaged. (4) work environment ,. : Light-emitting diodes with a working temperature range, below or above this temperature range, light-emitting diodes will not work, efficiency is grea...