Glow led's using AC current(220-250V)

Note :- THIS INSTRUTABLE SHOULD NOT BE ATTEMPTED UNLESS YOU ARE 
FAMILIAR WITH THE RISKS OF WORKING WITH MAINS VOLTAGE


To make this project you will need only few components.
And you could make your own led lamp or decorating light and many more things that you can imagine. This project is just an example to how to build the circuit for glowing led's using 220-250v.

Step 1: Components Required.

>Led's (number as ur choice)
> 4007 Diode (4).
> 250v Polyfilm Capacitor (1) .
> 50v (100 uf) Capacitor (1).
> 1000 m ohm Resistor (1).
> 0.220 k ohm Resistor { should be big in size else the curcit would not work }  (1). or something near this value. 

Comments

[gollu]

sir, i need 2 connect 5 different colour 3v leds in series. it should glow like flickering iam gng 2 use for decrotive purpose..plz gve a example circuit as soon as possible....

[despond]

*IMPORTANT*
The comments here are full of dangerous errors and confusion.
An AC mains mistake can *KILL* you or someone else.

Read this page, which explains the theory properly:

http://www.marcspages.co.uk/tech/6103.htm

[pro5200]

Can I use this scheme, for 16 pieces LED?

[irfan bangash]

u used only 2k2 1w Resistor (6) and Diode 4007 (4)
25LED

220v and 240v only

[pro5200]

OK, i don't know how much value farad the polyfilm capasitor ?

[sbdash11391]

google the 474j...part written on it and you should get a value

[chnaveed.alam]

how to calculate wattage of a resistor
e.g 200 ohm 1/2 watt etc what is it's formula

[chnaveed.alam]

hello there
does diode used as bridge can u tell me what is its purpose

[sahil263]

hi there,

read this

http://en.wikipedia.org/wiki/Bridge_rectifier

[chnaveed.alam]

thanks frnd

[samalert]

Very Glad !!!! that u made such a wonderful thing. I was searching for this since i didn't want an adapter hanging from above over ceiling, this will help me a lot.... but i have some doubts.
1> output is 50v - so parallel connection not possible since single LED will carry only 3v [ now since 50 v if i try to connect 16 LEDs in series it shud suffice isnt it 3x16 = 48v] then why in some comments below it is 25 - 30 LED ?
2> if i want to decrease the voltage from 50v to like 12v or less what can be altered and to what amout (since am not into electronics and have least knowledge with not even the basic knowledge of multimeter) if you can suggest the amount and which part i would be glad
3> in your picture above i have seen you have just used 3 leds hw are those able to handle 50v o/p.
4> Now as u specified that circuitry gets a little hot now till how much time can this be left ON.

Tnx a ton for lending time and responding .
This prj is one of my favourite.

[seaspac]

Dear Sahil I think you dont know any thing about the circuit, and in many questions you have been misleading the people. I can see the values of the resistors from the color codes in the photos those are R1=1 Mega ohm - 1/4 Watt and R2= 220 Ohm 1 watt. while you said in a post that resistor R1 is 1000 Milli Ohm, and the big resistor is 0.218 Killo Ohm.

I will repeat the parts list agin for clearity R1 = 1 Mega Ohm 1/4 Watt, R2 = 220 Ohm 1 Watt, Capacitor in parrallel to R1= 0.47 Microfarad 450V, Diodes = 1N4007, Capacitor after the bridge is 100 Microfarad 50V.

Its a nice circuit but lot of confusion from your side about it.

[kushalverma]

i'm not getting a resistor of value 0.218/0.220 excluding this i've got everything now what should i do plz rply me fast as u can.....
KUSHAL

[sahil263]

hello there,

The resistors are mandatory for this Project.
You Cannot Build the project without the Resistors.

[irfan bangash]

0.220 k ohm Resistor is 1/2watt or 1/4 ?

i thk its 1/2watt

[mkrieg]

How nice to bring to light these LEDs!
This is music to my electronics - ears.
If you fear the risk of an electric shock, my advice is to simply use ready LED lights!
Here at home I for example use led spots from LEDoptix;-)

[sahil263]

Thank's for the suggestion.

[btmnet]

Hi, can i use different led like red colour and blue colour?

[sahil263]

Hi,
Ya sure you can use red and blue led's.

[kushalverma]

Hi Sahil i'm not getting the resistor of value 0.220 k ohm what should i do now plz help me it's very imp... plz help plzz....

[ijibang]

Thank you for sharing your project.
I intend to make several pieces of 4 LED's as night lights.
Could I ask your help to reconfirm the resistor value (both of them). Also why must you use 50V 100uF capacitor ? Does it mean that you can connect 1 to 17 LED's assuming they are 3V 20mA each?
One last thing, can the LED's be connected in parallel? Advantage/Disadvantage?

Thank you very very much dude!

[sahil263]

@ Ijibang, I am very sorry for a late reply.

the bigger resistor is of value 0.218 k ohm (note that when you purchase this resistor it should be big is size than normal resistors).

the 2nd resistor is of value 1000 mili ohm

you can use capacitor according your requirement of the LED's, as you have calculated.

and lastly i would not recommend you to connect the LED's in parallel (disadvantage).

[msaeed]

And One more thing...
You said its output Dc voltage depends upon the orange capacitor...
How ? if we use a 50 v capacitor then, would its voltage be 50 v..? or so?

[sahil263]

Msaeed, if we use 50v capacitor the output won't be 50v, but it would be some were around below 50v.

[msaeed]

Sory Sahil but i can't understand the resistor values.... is that 1000 mili ohms? or is it 1000 mega ohms...? i m new with these things.... Plz help ,
Regards.

[sahil263]

Msaeed, the resistor's value is 1000 mili ohms.

[sonyslave2]

does it put off any heat?

[sahil263]

yes it dose gets little bit hot. but not to very.

[Yusufi]

Your project is very nice guiding,but I have little confusion that maximum how many numbers of LED we can use.....?

[sahil263]

thanks for your comment......
you could use approx. 30 led's
depending upon which led's you use...

[Ned Kelly]

Hi your resistor values are 220 ohms   Ie red red brown and the other is a  1 megohm Brown black green , Go for it young un  good trying from an old 80 year old technichian

[rhendric]

Actually, if you look closely, there is a grey band between the two reds, and a gold one after the silver band. however, he is still off, I believe.

[sunnysupport]

My Question is, How can we Attach Chargeble Battery (4.V) with this circuit,

actully I have made one lamp base upon the above mentioned circuit, i want

to make this lamp chargeable.

[siddhansh91]

what is d output DC voltage of this circuit?
can anyone help me?

[sahil263]

The DC output depends on the orange cap i.e. 50V(100uf) in this project. You could change the cap according to your requirement. But the uf value should remain same i.e. 100uf 

[Xellers]

Does anyone know what values will be necessary for the RC dropper in order for this to function with 120VAC?

[enderak]

 Hocam eline sağlık güzel ve Türk işi olmuş 220v tan ne olur ki korkuyorlar :)

[sahil263]

sorry i can't understand your language.

[lemonie]

I wouldn't be happy touching / using that thing with the way the soldering looks. It's simple, but rather risky.

L

[sahil263]

i just posted n example that how to construct this project.
but, obiously you should be careful while performing this project.

and thanks for your comment.