Simple LED Driver Circuit. Simple LED Constant Current Lighting Circuit. Design Specifications www. List of Figures 1 Schematic for 70W Streetlight LED Driver With SecondarySide Regulation Part 1. Semiconductor Components Industries, LLC, 2012 September, 2012 Rev. Publication Order Number NCL30000D NCL30000 Power Factor Corrected Dimmable LED Driver. LED related electronic circuit diagrams circuit schematics. Note that all these links are external and we cannot provide support on the circuits or offer any. Linear Technology has a very broad line of LED driver ICs for automotive, display backlighting, handheld and general lighting applications. They are configured as. Highpower LEDs the future of lighting but. Power LEDs are now widely available in the 3 to. Good morning kind sir. I was skeptical that this circuit would work due to its simplicity. However, it worked fine and I am quite satisfied. In the article you. There is a lot of effort going on to improve the technology of LED Light Emitting Diode lighting. The reason is that LEDs are much more efficient than standard incandescent or CFL light bulbs. They also last longer than either of the alternatives and dont have issues with disposal like CFL bulbs. LED lighting has a lot going for it except one thing. It is still pretty expensive. At any rate I have been doing a fair amount of reading in the engineering trade journals on the subject and have been wanting to play around with LED lighting. Over the last year or two I have been collecting high output LEDs that I have been able to pick up inexpensively at hamfests and surplus places. In some case I have gotten some nice LEDs for under. Alimentatie Culturism Program. When you are using an LED as an indicator in a project you usually just drive it with a voltage or microcontroller and a current limiting resistor. In these situations you really dont worry too much about driving the LED for its maximum output or worry too much if the current changes a bit due to variations in the supply voltage or changes to the VI voltage current curve as the LED heats up a bit. You also dont tend to drive it anywhere near the LEDs limits so there is plenty of margin and the LED will last practically forever. In a lighting application you want to get as much light as possible out of them so the LEDs should be driven with constant current. The same amount of current should always be going through the LEDs regardless of changes in the circuit over time, temperature or other reason. Needless to say, there is a lot of work going on developing integrated circuits for driving LEDs. Most are similar to switching power supplies. These are very efficient, often over 9. Even if you are designing a microcontrollerbased LED display system, often it may calls for a manual option to control brightness of the LED display unit. Highpower LEDs challenge electronics engineers to design accurate and efficient, yet simple, driver circuits. Conventionally, driving highpower strings with. Driver ICs. SSL product developers can implement LED control electronics, either buying and integrating offtheshelf modular drivers or working with ICs and discrete. LED Dimming Driver ANZ Z151c, March 15, 2010 TBAR LED Power Supply SwitchMode LED Driver Total Power 60 96 Watts Input Voltages 90264 VAC or 100277VAC. The downside is they are somewhat complex for playing around with and many come in fine pitch surface mount packages that make building a circuit without a circuit board a major exercise in frustration. Many are kind of expensive in small quantities as well. My pile of inexpensive LEDs continued to grow. Finally I came across a neat circuit in the January 6, 2. EDN magazine.    The author, Eliot Johnston,   used a simple two transistor, two resistor analog constant current circuit to drive LEDs in an outdoor illumination system. Brilliantly simple Sorry about the pun. Transistors drive LEDs to light the path.