White LED Lamp

Posted on May 3, 2010 by D.Mohankumar

This is the simple version of a white LED lamp that can be directly powered from mains.
It can give ample light even for reading purpose.

Capacitor CX along with diodes D1 through D4 forms the AC step down circuit. CX reduces high voltage AC from mains to a low voltage AC which is rectified by the diodes D1-D4. Capacitor C1 removes ripples from AC so that low voltage DC is available to power the LEDs.CX is the X rated AC capacitor that reduces AC voltage through Capacitive Rectance property. Resistor R1 is very important to remove the stored voltage from CX when power is switched off. This prevents lethal shock. Resistor R2 limits the inrush current. More LEDs can be added by reducing the value of R2.

White Led Lamp circuit

Shock Hazard

Since the circuit is directly connected to mains, take utmost care to avoid shock. No components should be touched when it is connected to mains. Construct this circuit only if you are experienced in handling high voltage AC.

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AC POWERED WHITE LED LAMP

About D.Mohankumar

D. Mohan Kumar M.Sc., M.Phil, is the Former Head of the Dept. of Zoology, Govt. College for Women, Trivandrum, Kerala, India, Former Member of Academic Council, University of Kerala and Former Member of Board of Studies in Kerala, Calicut and Kannur Universities. He is the Subject expert of Biology in Talent Spire team for Entrance exams. He is an avid electronics enthusiast and has been designing circuits for the past 30 years. In this period he has supported many electronics/electrical engineering students in their final year projects. He is a regular contributor to Electronics For You magazine which is South Asia’s largest circulating electronics magazine published from New Delhi.
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