So, im currently in the process (a very slow one) of making a 3W luxeon helmet lamp for the bike. Ideally i want about 4 to 5 hours from it, which will get me a ride + comfortable backup time. So, the question is this, i can either use a 3000mah battery, which should run it for around 5.5 hours, or, i was thinking i could maybe knock together some kind of pwm circuitry. Does anyone know of any? It'll be running off a buckpuck and drawing about an amp, so im guessing ill be looking at using something to switch a transistor
Any input would be greatly appreciated.


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) so give me a shout then if you can wait.
sounds funny, but is very simple. to cut power, simply cut power to the 555. what voltage you driving the buckpuck at? remeber bipolar's have a voltage drop.
