LEDs are being Incorporated in vast magnitudes today for everything that may involve lights and illuminations. White LEDs have especially become very popular due to their mini size, dramatic illuminating capabilities and high efficiency with power consumptions. Here we are discussing the making of a simple LED bulb CIRCUIT DIAGRAM, Which i have built and tested.


The circuit of a LED bulb explained here is very easy to build and the circuit is very reliable and long lasting. The exclusive surge protection feature included in the circuit ensures an ideal shielding of the unit from all electrical power ON surges. Looking at the figure we see that basically LEDs have been used which are connected in series. The diagram shows a single long series of LEDs connected one behind the other to form a long LED chain. The power supply circuit used for powering these arrays is derived from a high voltage capacitor, whose low reactance is exploited for stepping down the high voltage input to a lower voltage suitable for the circuit. The two resistors and a capacitor at the positive supply are positioned for suppressing the initial power ON surge and surges during voltage fluctuations. In fact the real surge correction is done by C1 introduced after the bridge (in between R1 and R2), this modification has been incorporated in this circuit after a long research process by me to protect the circuit from voltage surges.

All instantaneous voltage surges are effectively sunk by this capacitor, providing a clean and safe voltage to the integrated LEDs at the next stage of the circuit. CAUTION: THE CIRCUIT SHOWN BELOW IS NOT ISOLATED FROM THE AC MAINS, THEREFORE IS EXTREMELY DANGEROUS TO TOUCH IN POWERED POSITION.


R1 = 1M 1/4 watt

R2, R3 = 150 Ohms 1watt,

C1 = 474/400V or 0.5uF/400V PPC

C3 = 10uF/400V

D1—D4 = 1N4007

All LEDs = white 5mm straw-hat type

input = 220 mains….




The Circuit board arrangement


An illuminated object 


LED arrangement in series

Updated Model of the LED lamp


The updated LED light Model with better illumination capacity and a better neck too [compared to the previous one]


A closer view of the ‘Illuminator’ .


  1. ranga2004ngarajan

    April 9, 2013 at 9:54 pm

    Does this run directly off the mains? How much electricity does this needed to make this work?

    I have a layman question: If this runs of less than 220v of electricity then what happens to the remain volts than that is required to glow the few LEDs? If the electricity is wasted, can we find ways and means by which we can use lesser electricity?! Sorry if the question does not make sense, but I will learn from your answer to refine my questions 🙂

    What is the amount of light that is emitted from this? You can say it as equivalent to standard available bulbs.

    Then the last question, and what is the life of these bulbs?

    • Yes, this circuit directly runs from the mains [220V]. I have used 30 LED’s in this circuit and the voltage which is coming after the rectification is around 95 volts. This circuit can power 10-50 LED’s. Actually the circuit takes 220 V supply as the input and then the Bridge rectifier in the circuit converts the AC voltage into DC voltage,and the capacitor C3 filters the rectified DC. This is then fed to the series of LED’s to light them up.

      There is surely some voltage left unused in this circuit, one way we can employ to reduce the consumption of electricity is by changing the whole circuit into a rechargeable battery operated circuit in which only the power which is required is used for lighting. A point which is to be seriously considered.

      Anyways in comparison it consumes only 2 watts power, equivalent to a 60 watt filament bulb. Typical incandescent bulbs last 1,000 to 2,000 hours. But in speaking about LED replacements, lamp life is routinely quoted as 25,000 to 50,000 hours. Long lamp life, and the reduced power used to create the same amount of light, is what makes this technology so promising.

      The life of these LED’s is guaranteed around the mentioned life span, provided there is no power surges and the circuit supplies the proper rated current to the LED’s. For this i have incorporated a surge protection technique mentioned in the post.

      • What will happen if I use less than 10 led or more than 50 led. I think 3.5V for a single led then for ten in series requires 35v and 175v for 50 you said that 95v is the output. Please explain about the voltage for number of LEDs.and how can your circuit adjust voltage with LEDs. I think 10 LEDs get burn on 95v and 50 LEDs get low brightness. Please help…

        • Since you will be using normal 5mm LEDs the voltage drop per LED should be around 1.5V and it should draw about 15-20 mA of current.
          You can use less than 10 LEDs in the circuit also, but if you use more than 50 LEDs then each LED will not be getting enough voltage to light up and as a result all the LEDs might not light up, and the brightness of the LEDs might fall

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  39. what is the minimum or maximum LED lights can use this circuit. what is the volt of par LED

    • The minimum number of LEDs will be around 10 and maximum LEDs used here can be around 50. Each LED needs about 1.5 V and about 15-20 mA of current to light up brightly.

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