LED Boost Circuit

Posted on Aug 2, 2012

The completed board may be driven by voltages between .8 and 3 Volts. While the basic design goal was candle like light from a single cell, the values used were chosen to allow safe operation from 3 Volts so you can, for example, use it to drain the last bit of energy out of used Lithium based cells from flashlights. This means that you can also drive it from a fresh 123 cell at full brightness (for 16 hours or so) or two NiMH, alkaline or other cells in series. While the current consumption (and therefore light output) goes down with supply voltage, some light is produced even with very low inputs.

LED Boost Circuit
Click here to download the full size of the above Circuit.

How to assemble the Boost Driver Printed Circuit Board 1. Trim the board to the final size you want before assembly. The board may be sawn, sanded or filed to shape. It is designed to be round should you want, a bit less than the diameter of an AA cell

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