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In this video, I will show you how to build a highly efficient Joule Thief circuit that can light up a 5W LED bulb using just a single 1.5V battery (even old/discharged ones). By pairing a BC547 and BC557 transistor with an inductor coil and adding an LDR (Light Dependent Resistor), we also convert it into an automatic dark sensor that turns on only at night.
Components Used: • BC547 Transistor • BC557 Transistor • LDR (Light Dependent Resistor) • Inductor Coil (reused from old circuit boards) • Capacitor & Resistors • 1.5V Battery (AA / AAA) • 5W LED
Watch the full tutorial to see the schematic, breadboard testing, and PCB assembly.
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