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LED circuits  related subjects: Infrared sensors, Infra red remote control protocols, LED Technical Information, Optics
10” LED Backlight from a Single Cell Battery LED backlights have been used extensively in small and medium size portable LCD displays – generally less than 3 inches. In many cases, these applications require two to four white LEDs (WLEDs) in parallel, pdf file
13 Color LED Rainbow
1.5V LED flasher 1.5V LED flasher, 74AC14, pdf file
2 Transistor LED Flasher  a classic 2 transistor astable multivibrator schematics
9V LED flasher 9V LED flasher, 2 transistors
36-led flashlight with switching power supply
555 LED flasher This circuit is powered by a 9 volt battery, suitable for warning lights on a tall structure
3V LED flasher 3V LED flasher, 2 transistors
72 LED Clock
AC Line powered LED This application note describes the basics for powering high current light emitting diodes (LEDs) utilizing a capacitive divider circuit off the ac mains, pdf file
AC Line powered LEDs The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage and a small resistor to limit the inrush current
AC-Powered LED
AC Powered White LED Strings
Animated LED Animated LED, PIC16C84, a 4x4 pixel animated LED billboard of the type commonly seen at railway stations, in store windows and so on
Bicolor LED Driver
Bicycle safety lights bicycle safety lights, 555 circuit, Flashing 13 LED unit, 3V supply
Big 7-Seg LEDThe circuit uses a serial-in-parallel out shift register, 74HC595 for receiving serial data from uController board
Buck-based LED Drivers Constant current switch mode power supply. This Application Note discusses the design of a buck-based
LED driver using the HV9910B, pdf file
Build your own simple 9-LED Flashlight- the basics With white LEDs getting down to about $1.2USD, there's every reason to make your own flashlight. Whether you want a small light with just one LED, or one with maybe 9 LEDs that is as bright as a serious flashlight, or even to replace the car's dome light lamp bulb with something that won't run your battery down, this info will get you started
Constant Current Buck Regulator for High Power LED Drivers LM3404HV - 1.0A Constant Current Buck Regulator for High Power LED Drivers
Constant Current LED Driver pdf file
Constant Current LED Driver constant current source led array, pdf file
Constant-current SMPS drivers for LEDs a high power constant-current Black regulator
Crossing light flashers train, Crossing Light Flasher Circuits, Low Power Crossing Light Flashers
Dual Gate Inverter Oscillator Increases the Brightness of LEDs While Reducing Power Consumption pdf file
Deluxe RBG LED Blinky The Lux Spectralis is a deluxe RGB (red, green and blue) LED (light emitting diode) blinky that you can build. Soldering is required. You will need a soldering iron, some solder and a pair of wire cutters to assemble the kit. Not shown in the photo is the battery holder that holds 3 AAA cells, not supplied. A small microcontroller (Atmel AVR ATtiny13) is preprogrammed with many different display modes that you can select with a pushbutton
Flasher low power LED flasher, LM3909
Flashing LED advertising badge pdf file
Fun with LEDs LED Chasers, Sequentially Off LED Pulser
Highly Efficient 0-100% LED Dimmer This webpage describes a highly efficient LED dimmer, or a dimmable LED flashlight
High Efficiency 12V White LED Driver
High-Power LED Driver Accepts Wide Input-Voltage Range Circuit based on a buck/boost converter controller regulates current to a white LED, despite an allowed variation of input voltage from 2.7V to 16.5V, pdf file
Knight-rider-LEDs TL082, LM3914
LED Chaser an oscillator made up of two sections of a 4011 NAND gate is employed, 4017 CMOS Counter
LED circuits
LED Constant Current Source Scheme LED Constant Current Source Scheme, LM317L
LED cube
LED flasher LED flasher designed for 3V battery operation
LED flasher
LED flasher a project to flash a Light Emitting Diode (LED), schematics
LED flasher circuits
LED dimmer single FET controls LED array, pdf file
LED dimmer LED dimmer circuit
LED dimmer LED dimmer circuit
LED dimmer uses only two lines provides 32 steps of brightness control—from 0 to 100%—for a backlight or instrument panel, using just two general-purpose-microprocessor signals, MAX5160, pdf file
LED driver for low voltage halogen replacement a novel approach for driving high power LED's as a replacement for low
voltage halogen lighting systems, ZXSC300, pdf file
LED Drivers for Display Backlighting and Other Portable Applications Series LED Drive vs. Parallel LED Drive, Inductive Boost vs. Switched-Capacitor Boost for the LED Drive Application, LED Drive Efficiency, pdf file
LED Flasher Projects LED Flasher Projects
LED flashlight LED flashlight circuit
LED lamp dimmer LED lamp dimmer circuit, This simple Linear circuit provides continuously variable regulated current (~25-400mA) from a 4-6 Volt source
LED Lighting Semiconductors
LeD MaTRiX This is a simple, programmable, autonomous and extensible LED matrix with the possibility of being controlled by a computer using a RS232 connection. Its basic modules are the Controller Board, the I/O Port expander boards and the LED matrix cardboard support. The micro controller is a common Microchip, PIC16F88
LED modifications a list of various modifications made to incandescent flashlights
LED power supply LED power supply - Single AA cell powers two LEDs at constant current
LED stroboscope design of a stroboscope circuit
Low battery voltage flasher Low battery voltage flasher, PANASONIC MN13811-G, 2 transistors, pdf file
Low power LED Flasher 4 components, including 1.5V battery, LM3909
Offline LED Driver with Supertex HV9910
PWM RGB Controller describes the design of a Pulse-Width Modulated Red-Green-Blue controller
RGB LED Fashion Lighting Controller controller for RGB LED fashion lighting, pdf file
Simplest LED Flasher circuit
Single and Two Cell White LED Drivers Without Inductors Three inductor-free circuits that allow a white LED or UV LED to be driven from one (1.5 volt) or two flashlight cells (3 volts total), Pulse Boost White LED
Single cell LED flashlight Single cell LED flashlight
Solar Garden LED Turn on a high-bright white (or yellow) LED at dusk and off during daylight hours
Solar Powered Night Light LM2941, TLC27L4, CDS photo sensor
SPI Interface Big 7-Seg LED The circuit uses a serial-in-parallel out shift register, 74HC595 for receiving serial data from uController board
Two-transistor circuit lights LEDs The circuit uses a 2N3904 NPN transistor and a 2N3906 PNP transistor, which operate as a high-gain amplifier
Three-Color Display using Bicolor LEDs The circuit presented here uses bicolour LEDs to generate a display in three colours, namely, red, green, and yellowish green
ULTRA-BRIGHT LED LAMP this ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, ..., These LEDs emit a 1000-6000mCd bright white light like welding arc and work on 3 volts, 10 mA, pdf file
White LED driver circuit ZVN2106 MOSFET, pdf file
White LED driver circuit step-up white LED driver circuit, pdf file
White LED Flashlight Schematic LM334, gif file
White LED voltage converter White LED voltage converter circuit
White LED voltage converter Three inductor-free circuits that allow a white LED or UV LED to be driven from one (1.5 volt) or two flashlight cells (3 volts total) are described

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Last updated on: 2011-01-15 | Copyright © 2011-2013 Educypedia.