Concept flashing 2 1watt white LEDs using a 1.5 volt supply not tested this is just concept experimenters circuit so many variables effect it function L rb tffon/tOff Vcc can be expanded for more LEDs
Each LED is 3.2 volt 280mA
Don't have to be 1 watt leds you could drive a string off 20mA LEDs using low voltage supply
Current builds up in the inductor during tOn at tOff the transistors turns off the inductor flysback and generates a rising high voltage at the collector this is clamped by leds to about 8 volts discharging the inductor through the LEDs
