Constant Current Supply For LED\'s

This circuit provides a constant amount of power to the LEDs and also provides a constant amount of light for a longer period of time. This circuit also allows the LEDs to run on almost any normal voltage above 4 volts. This means you can use multiple sources of power for the same light, a few AAA batteries, or even a car battery.

Constant Current Supply For LED’s: [Link]

Mobile infrared electronic transmitter