So there are a ton of instructables covering the use of high brightness leds. Many of them use the commercially available Buckpuck from Luxdrive. Many of them also use linear regulation circuits that top out at 350 mA because they are highly inefficient. This instructable serves to let people know that there are other options out there to drive high power leds.
1.5A Constant Current Linear Regulator for LEDs - [Link]
João Silva writes:
Some time ago I had the idea of building a LED lamp that was solar powered, harvesting the Sun during the day and charging the battery, while at night deliver some light. The idea was to extend the hours of light of my peppers during the winter, once the vase was inside the house. [via]
LED SolarLight - [Link]
A small ATMEL ATtiny13A microcontroller (IC1) is the brain of the circuit. One pin (PWM) blinks the lights, most of the other pins are used for programming and power. You could get similar effects with a 555 timer or discrete components, but our goal is to learn about a new microcontroller family and make something easy to hack. [via]
Hackable LED Christmas card - [Link]
This tiny circuit is a simple way to make a fading led without having to program chips or writing code. Just a few simple components and you’re ready to fade all day. The end result is a constant fade up and fade down just like a Mac on standby.
Throbbing / Fading LED with 555 Timer - [Link]
Step-by-step, easy to follow instructions on the building of a LED Rainbow RGB LED PWM Controller. Only a minimal amount of parts are needed, along with a PIC processor, and you can construct one of the most amazing LED controllers available.
The system is capable of driving either RGB LEDs, or individual Red, Green and Blue LEDs to produce stunning effects.
LED Rainbow – RGB LED PWM Controller - [Link]
Many people assume that all LEDs can be powered with a constant 3V power source. LEDs in fact have a non-linear current-voltage relationship. The current grows exponentially with the voltage supplied. There’s also the misconception that all LEDs of a given color will have a specific forward voltage. The forward voltage of an LED does not depend on the color alone and is affected by other factors such as size of the LED and its manufacturer. The point is, the life expectancy of your LED may degrade when its not powered properly.
Current Regulated LED Tester - [Link]
Follow these simple instructions to build you own RGB LED PWM driver. This easy to construct, versatile driver board will allow you to make your own RGB LED driver that can be built into all kinds of lighting effects. It doesn’t need DMX or any other external controller to operate, just a suitable power supply. The firmware is available as a free download and the sequences fully customizable, so if you have access to a PIC programmer you can create your own range of sequences for use with the kit.
Versatile RGB LED PWM Driver - [Link]
This RGB LED controller kit is somewhat different to other offerings on the ‘net. Whereas most others use a single button to step through short pre-programmed loops this controller is intelligent enough to understand different colour palletes and generate colours in real time using a huge 8 million bit randomiser. It lets you choose a colour pallete from sharp vivid colours to soft pastels and the speed and way it will move between them. It also has a selection of other effects thrown in just for good measure, and remembers it’s current settings when the power is turned off.
Build a better RGB LED controller - [Link]