wellington Posted July 9, 2004 Report Share Posted July 9, 2004 From: ELMThis is a practical white LED head mount lamp (flashlight). Recently many white LED flashlights appear on the market. However, most flashlights require three cells because they are regurating output current with only series resister. The odd number of cells except one is not good, and a margin between VLED and VBAT is too small, intensity of light is affected by variation of input voltage within the battery life. Thus I built a white LED head lamp which operates with two cells and controls output current. Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 9, 2004 Report Share Posted July 9, 2004 Wellington,It not only controls the output current, but it also steps-up the voltage with a DC to DC converter. Quote Link to comment Share on other sites More sharing options...
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