About twenty turns on each side will be quite enough. The coil may be wound over a T13 torroidal ferrite core using a 0.2mm or 0.3mm super enameled copper wire. Coil = 20 turns each side using 1 mm enameled copper wire over a ferrite ring which accommodates the winding comfortably.D1 = 1N4007 better if BA159 or FR107 is used.The above design may be improved further by attaching a rectifying network using a diode and a capacitor, as shown below: Parts List If you see the circuit diagram the only seemingly difficult part is the coil, rest of the parts are just too easy to configure. However if you have a suitable ferrite core and some spare thin copper wires, you would make the coil within minutes. Let's try to understand the proposed circuity with the following points: Of course this would mean the battery getting drained pretty much earlier than a 5mm LED, but it's still economical than using a two 1.5 cells and not including a joule thief circuit. The concept discussed here remains exactly identical to the usual joule thief configuration, we just replace the normally used 5mm LED with a 1 watt LED. The present article discusses 3 such circuits, however here we replace the traditional 5mm LED with a 1 watt LED. Moreover the circuit additionally makes sure that not a single drop of "joule" is left unused in the cell.Ī joule thief circuit is pretty popular with all electronic hobbyists, because the concept allows us to operate even the white and the blue LEDs from a 1.5V source which normally require 3V to illuminate brightly. Technically it may seem impossible to illuminate a 3.3 V LED with a 1.5V source, but the amazing concept of joule thief makes this look so easy and effective, and virtually unbelievable.
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