can be driven much more efficiently compared to the traditional methods.
study the example circuit which can be effectively built at home and used as a
simple and efficient LED flashlight.
LEDs are getting popular day by day and are being
incorporated for many applications wherever an economic lighting solution
becomes an issue. LEDs are by itself are very economic as far as power consumption
is concerned, however the researches are never satisfied and they are trying
hard, relentlessly to make the device yet further efficient with their power
explained needs just 1.5 volts for operating which looks pretty amazing and too good
to be true.
can easily find that these devices need a minimum of 3 volts to light up
producing the same as with a 3 V battery.
becomes very special.
heart of the circuit.
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.
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.
consumption also becomes partial making the consumption very economic.
single transistor T1, a couple of resistors R1, R2 and the inductor L1 for the
instantaneously through the left half winding of L1. This pulls the current
stored inside L1 through the collector of T1 to ground which is
technically twice the value of the applied supply voltage.
action inhibits the base bias current of T1.
value of the supply voltage, generated as a result of a back EMF from the coil
is dumped inside the Led, illuminating it brightly.
or even less when the T1 switches ON once again, because its collector is no
longer pulling the base drive to ground during that instant.
above at a very rapid rate.
condition, making the whole proceeding truly efficient.
does not carry much criticality, you may try a number of versions by varying the
number of turns and by trying out different material as the core, of course they
all must be magnetic by nature.
1amp transformer. Use the secondary winding wire.
above wire needs to be wound.
forget to remove the center tap at 50th winding.
in your junk box, you may try it for the design.
from the twin section and wind it over an iron nail having a length of about 2
inches. Wind at least 50 turns and follow the procedures as explained above.
the LED and you can use the unit for any relevant desired application.
white/blue LED driver circuit: