Wonderful summary of LED application circuit diagrams (I)

Passive PFC Constant Current LED Driver Circuit: 18W, 10V, 1.8A Output, 185–265 VAC Input, Passive PFC Flyback Power Supply

    To accelerate the commercialization of LED lighting, Energy Star in North America has established testing specifications that are very different from traditional lighting based on the characteristics of LED lighting products, including ambient temperature testing, integrating sphere measurement, light distribution

LED guardrail tubes are made of high-quality ultra-bright LED light-emitting diodes and are mainly used for urban landscape lighting. LED guardrail tube principle The seven colors are achieved by mixing the three primary colors of red, green and blue, and the pulse width modulation of the output wavefo

Connect 8 LEDs to a certain IO port of the 51 single-chip microcomputer, connect a button switch K1 to the external interrupt 0 input P3.2 (INT0) pin, and connect a button switch K2 to the external interrupt 1 input P3,.3 (INT1) pin. It is required that when K1 and K2 are not pressed, the 8 LEDs will display one by on

There are two methods for sorting LEDs: one is chip-based test sorting, and the other is test sorting of packaged LEDs. (1) Chip testing and sorting LED chip sorting is very difficult, mainly because the size of LED chips is generally very small, ranging from 9mil to 14mil (0.22-0.35nm). Such small chi

There are many factories producing LED tubes, and the quality of their products varies greatly. The prices of LED tubes are transparent and chaotic. The same specifications marked by each factory have prices that vary by dozens of yuan per tube. Even for experts, it is not easy to explain this huge price difference to

　　Technical features of full-color LED display: 　　1. The most advanced 65536 (16-bit) grayscale control technology is adopted to completely solve the mosaic phenomenon of the full-color display screen when displaying at low grayscale, so that the displayed image has a natural transition, delicate and bright colors, a

　　In addition to meeting safety requirements, the LED drive circuit should have two other basic functions. First, it should maintain constant current characteristics as much as possible, especially when the power supply voltage changes by ±15%, the output current should still be able to change within the range of ±10%