The circuit of a simple Blue and white LED driver explained needs just 1.5 volts for operating which looks pretty amazing and too good to be true.
If we go through the datasheet of a blue or a white LED, we can easily find that these devices need a minimum of 3 volts to light up optimally.
However the present design employs just a single 1.5 V cell for producing the same as with a 3 V battery.
That’s where the whole configuration becomes very special.
The trick lies with the inductor L1 which in fact becomes the heart of the circuit.
The entire circuit is built around a single active component T1, which is wired up as a switch and is responsible for switching the LED at a very high frequency and at a relatively high voltage.
Thus the LED is never switched ON continuously rather stays ON only for a certain portion of the time period, however due to persistence of vision we find it switched ON permanently without any oscillation.
And because of this partial switching the power consumption also becomes partial making the consumption very economic.