Quote:
Originally Posted by AudreyWarren
It seems wiring a flashlight is very tough job. Do you have any circuit diagram which could simplify bit more? Thanks in advance 
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Do you have a particular flashlight in mind? I know what we did was use a spike relay to handle the on/off control and then connected that you a (fuse protected) DC-DC voltage regulator (product number BOB-09370 from sparkfun for the exact one). The voltage regulator was tuned to around 4.5 volts (Or something close to that) which matched what the LED required.