Tuesday, June 18, 2013

Mains Powered LED Lamp - Hobby Electronics

Welcome everyone to my blog. Today I'm going to show you how to make a small LED lamp from AC main power which can be used as a Table lamp or maybe a staircase light.


Why LED Lamp? 

Look back 10-15 years, people used Incandescent light bulbs of 25-40 Watt range for table lamp which was not a very small amount. As time goes on Fluorescent lamps became more popular and people started replacing those Incandescent lights with Fluorescent ones which resulted in a reduction of energy consumption as now you can use a 7 Watt Fluorescent to get the job done.

As time goes on now we have even more efficient lamp which will take even less power. These are the modern LED based lamps.

So, here is the diagram of a LED based table lamp from AC main power.

Diagram:





How It Works:

In this circuit a very simple Capacitive voltage dropper is used. The 0.22uF 400V capacitor will do that job. The 1Mega Resistor will discharge the capacitor after turning the circuit off. Bridge rectification is done by four general purpose diodes and it is smoothed by the 4.7uF capacitor which will help reduce the flickering. Finally a current limiting resistor is in series with the White LED array.

Warning: 
 
As this circuit works directly from AC main line and is not isolated, you need to be cautious about electric shock hazard. Do Not let the working circuit be touched by Anyone.


More For Experimenting:

You can do a lot of experiment on this circuit. You can change the values of Resistors and capacitors to see what happens. But before connecting any load make sure to check voltage.

Good Luck everyone.

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