LED Circuitry

Hi, you always hear about headlamps and such that have circuitry to maintian a certain volatage to regulate the lights brightness as the batteries die. As and electrical engineering student, I am curious to know what type of circuitry is used without cracking open my own headlamp. Anyone have any idea or comments?
Thanks

There are numerous circuits out there, but try googling for 'buck puck' to get you started. This is an IC that does most of this circuit wizardry. Maxum/Dallas also makes some ICs that I have considered using.

I can't remember where, but I found some examples of non-IC discrete examples of how this is done and theory behind it all.

It's real simple and AVRs can handle the PWM for the strobe and dimming.

Blackbeard.

Check out candlepowerforums.com.

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