Battery Operated LED Lantern

  
Photo. This is the test circuit -the basic driver is only two transistors, two resistors, the circuit was evaluated using a white LED, but when it was time to button it up and archive it, I replaced the expensive white LED with a cheap green one.
Battery Operated LED Lantern - schematic

When Dave and I were kicking around ideas for the best arrangement of components for white led flashlight, Dave suggested putting the voltage converter in place of the second cell in a two cell flashlight, and substitute an LED assembly for the incandesce



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