Instructables
Picture of LED GLOBE
LED Globe is a light consisting of 240 LEDs, which gives a very pleasant light, at the same time lighting up the whole room. It is suitable to be hung in your Drawing room, Dining room or Bedroom. It runs on 12 volt 1 Amp. AC Transformer connected to the house mains of 220 or 110 Volts.
 
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Step 1: Things you will need: -

Picture of Things you will need: -

One AC Transformer of 220 to 12 volt AC, 1Amp.

240 Bright White LED’s size 5mm.

Mild steel wire to make the supporting rings.

Electrical thin wire, solder etc.
5mm Iron Rod to make the HOOK.

Step 2: Construction of the GLOBE

Picture of Construction of the GLOBE

Make 3 Big Rings out of the Mild steel wire of the same size and 2 small rings of same size.

Tie up the 2 Vertical rings with the Horizontal ring with thin wires as shown in the illustration. Take care to see that there is no electrical connection between the Vertical and Horizontal Rings.

Wrap cello tape around the Horizontal rings to make it a bad conductor to Electricity.

Now tie up the 2 small rings, one at the top and the other at the bottom of the GLOBE.

Take care so that there is no electrical contact between the Big rings and the Small Rings.

Step 3: Circuit for the LED's

Circuit for the LED’s.

Here we will be using two types of LED circuit for this project.

8 Double Row and 8 Single Row of LED’s.

5 LED’s have been used in one ROW because……………

12v x 1.4 = 16.8

16.8 divided by 3.5v = 4.8 or say 5 LED’s. in one row.

 

12 volt AC has been provided to 5 plus and 5 minus LED’s. In the Double Row LED’s.

The same 12 volt is connected to the single rows, See Diagram.

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money bags26 days ago
Great project
Great job Dipankar! This is a simple LED ball,if you wanna some information to make a full color LED ball,I'd like to offer more some tech info,but it's very complicated,it can't make by hand,it's picture at http://www.univiewled.com/creative/led-ball.html,if you wanna more info,I can get at carolcycling@gmail.com
crestind3 years ago
Would be interesting to have them mounted on one of those expanding spherical sculptures.
http://images.travelpod.com/users/pbprogo12/1.1275378962.large-metal-expanding-ball.jpg
ray_Bond3 years ago
Congurats Dipankar bhai another good work :)
so how r u ? and wats is next in line ?
Dipankar (author)  ray_Bond3 years ago
Thanks Pal,
I have not yet thought about my next Project.
The inspiration should come on its own.
Great job Dipankar. Check out my instructable too: http://www.instructables.com/id/Super-Simple-Automated-LED-Wardrobe-Lights/
ketan...
In india, u should really start selling this kind of stuff...
I dont think iv seen something so creative around!
Dipankar (author)  jayeshshinai3 years ago
This piece is already SOLD.
How much did you sell it for :O

btw, you could improve efficiency by wiring all the leds in series using 240v DC.

Dipankar (author)  qwerty1563 years ago
How do you convert 220v AC to 240v DC?
Algag Dipankar3 years ago
I think he means 24, cause i was confused too
Dipankar (author)  Algag3 years ago
I was also confused, yes I also think the same.
Yeah i meant 220v.

AC supply-Bridge rectifier-220v DC


Only problem is that in places like india, there are frequent fluctuations and that could result in problems (i have seen 195-246v) in my area
With a REALLY big bridge rectifier :-P
acornman3 years ago
Really neat Idea..... as there is no real need for this sphere to be hollow in terms of light emission ,instead of constructing fiddly wire hoops ,why not purchase a large polystyrene ball and mount the leds on the surface.Electrical insulation would be easier and the whole very light. Of course if you were to insulate carefully you could cover the poly ball in aluminium foil for extra reflection and for extra perzazz include a few rainbow slow colour change leds in the mix.
Algag acornman3 years ago
The problem with the slow change is that they would keep flashing on and off because of the AC so it wouldnt create the same effect, but it would look epic
Dipankar (author)  acornman3 years ago
Good idea, Thanks.
As you know all the sides are visible in the hollow sphere, whereas you can only see one side of an opaque ball.
You will agree with me that a hollow sphere has a beauty of its own?
You are not wrong It does have beauty there's no doubt, such a good springboard
though for other ideas.
rbland3 years ago
You WILL absolutly need current limiting resistors. LED's are very current sensitive. If your voltage rises by a few millivolts over the calculated voltage, the LED current will raise over the reccommended value of probably 20mA per LED.

Not all the LEDs will have the same forward voltage either.
You will probably soon find that one will fail, then another and then eventually all of them without any current limiting (usually a resistor in series).
Dipankar (author)  rbland3 years ago
My LED CHANDELIER which was published in Oct.2008 has the same circuit and till today it is glowing without a single LED packing up.
Three years is a long time for a trouble free performance, so why should I change my formula of 12 x 1.4?
SEE STEP 3 for details.
rbland Dipankar3 years ago
Hi again. It must be just luck that the voltage of the transformer is close enough to the correct forward voltage of the LEDs. Not everyones transformers will be the same volthage though and not everyones circuit will have the same characteristics.
kishore3 years ago
Its excellent,but you have not used any resistor for constant equal ant power to each LED.So till how long LED will glow continuously on 220, 12v, 1amps transformer , Previously I tried using using 236 Led in series circuit it did not worked on 220 ,12v ,1amps transformer, So I rectified with Resistor after every 4 led,8 Led then 12 LEd so on with every 4 led with resistor between value of 1,4 ups then it Glowed for continously
I think this is a great looking result, but like you, I would prefer it to be a continuous string running directly from the mains rather than the losses through a transformer.
Dipankar (author)  Treknology3 years ago
Thanks,
You are entitled to your ideas but, there is always a risk involved with using 220 volt AC. directly.
While prototyping and experimenting I would agree that ELV is the way to go. Errors tend to be much less painful.
Dipankar (author)  kishore3 years ago
In STEP-3 you will find the Maths regarding this project.
Dipankar,

Once again you pull off the wonderful!

Just the thing for a light for my buddy's cabin, (Most of his lighting is from a solar/battery system, and this will be a hit!!!!!!!

You do have a knack for this!
Dipankar (author)  trike road poet3 years ago
Thanks Pal,
You got it right.
thecageybee3 years ago
Can I ask, what's the reason that the LEDs are arranged in strips of 2 or 1. Is it not possible to do all double strips or all single strips?
Dipankar (author)  thecageybee3 years ago
As the Diameter of the Globe is less at both ends and more at the center, that is why I have used double strips and single strips of LED's to adjust the gaps.
ElvenChild3 years ago
! Flabbergasted!
arbita23 years ago
ok
mary candy3 years ago
I love it !
let's the party start !
Gr8 job.
pandyaketan3 years ago
The LED Master is back! 5 *s done!

reg
ketan
--------------------------------------------------------
"May the good belong to all the people in the world.
May the rulers go by the path of justice.
May the best of men and their source always prove to be a blessing.
May all the world rejoice in happiness.
May rain come in time and plentifulness be on Earth.
May this world be free from suffering and the noble ones be free from fears"
---- Vedic blessing
Sirji, you should also post videos on metacafe, youtube, etc - millions of ppl there!

You will get *thousands* of hits there "per day" and therefore, more ppl in the world will be able to find something useful.

Also, you can provide a link of your i'bles in your videos, so those who, after seeing the videos, want to read in detail, can visit here....

my 2 cents...

reg
ketan
mathman473 years ago
Great job. How about changing to 3-color LEDs & a micro to change colors? Now that would really be a show.

Your solution and instructions are so simple that even I can follow them. Not only do you have the ability to make the electronics simple, you have a knack for explanation too.. Thanks for sharing.
no need for a micro controller just use 3 pots
Dipankar (author)  mathman473 years ago
Thanks Pal,
Only problem with color LED's are that they do not give enough light to light up your rooms, and my intention is to have no other lights in the room except the Globe.
rimar20003 years ago
Good work, Dipankar. How many USA dollars cost the leds?
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