Example Micro-torch Circuit
Running an LED off just 0.75 volts to make a Micro-torch
With the LED connected, the voltage is clamped and the circuit produces short duration high-current pulses which drive the LED to full brightness without destroying it.
The result is an extraordinarily bright beam of light. The circuit is so small that it can be built into a key fob, a walking stick knob and many other common items into which a torch would normally not fit. The beam is bright enough to allow you to find your way along a path in complete darkness. Up to six ultrabright WHITE LEDs can be connected in series in this circuit and driven from a 1.5v cell.
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