Instructables

Light Bulb (World's Best) using wire connector & no Soldering !!!

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Make an led light bulb - without soldering !!

 
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Step 1: Parts

What you need is - 4 leds, one 10k 1/2 watt resistor, one 0.22 uF 400 volt capacitor and one wire connector !!

This runs on 230v AC. For 110v AC, change the capacitor values (to 0.47 uF, 250 volts).

Warning: This involves AC Mains ! Do not attempt, unless proficient.

Step 2: Work in Progress

Picture of Work in Progress
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Connect a positive leg of one led to a negative leg of another.

This is one pair of 2 leds.

Make as many pairs as you wish but limit it to 14 pairs (or 28 leds) for a single capacitor. you can have more if you add one capacitor and one resistor for the other 14 pairs( or 28 leds).

Attach capacitor & resistor. Any side will do since it is Alternating Current. See picture for more details.

Step 4: Final Result at Night !!

Picture of Final Result at Night !!

Looks much better in real life !! But see the pic !

Tip 1:

U can use this simple wire connector concept even for ur 6V & 9V projects and avoid soldering (allergy)!
Now you can always make a project instead of just reading them!

Tip 2:

Why are these "world's best" ?? Coz i used a single capacitor and single resistor and you can put 200 leds on it if you want! (Only 30 in this circuit, but follow Part 2 or Flood Light I'Ble, for 200 or more)
Funny how no one disclosed it to you earlier! ;-DD

Tip 3:

They last a lifetime. I am using mine (and few frndz too at their place) since few years with 8-12 hrs of use per day. Only 3 are in series. Then the triplets are in parallel. So only 3 will fuse out, if one LED goes bad. Out of the 3, isolate & find out which one is bad and simply replace!! Decades of good lighting!

Tip 4:

You can encase the project in a pet bottle to avoid moths, insects, lizards. (I have intentionally not done so to check if it shorts, but its working fine).
avishek89_roy2 months ago

Hi pandyaketan, thanks for sharing such a great idea. i will surely do it for myself. For my curiosity, i just want to know that what if i use 10k 1W resistor? And what will be total power consumption if i runs it for an hours.

pandyaketan (author)  avishek89_roy1 month ago

10k, 1 watt resistor provides lower current, so your leds may not light up.

Power depends on how many leds u plan to use.

reg

k

samalert11 months ago
Hey Khetan !
As i can see the output is 6v (but how much current ? )what if i want this same circuit and hook led strips. Now since the LED strips require 12v at 2A how would i achieve this?

Since am new to electronics i am not able to get the reason for one of my mistake which you might point out when i read your TIP 2:
What i did was http://www.instructables.com/id/Car-Interior-LED-Lighting-Multicolor/ but when i wanted more light i hooked more strips means i used 4 strips orginally but then in want for more light i hooked up 4 more so total 8 strips. And because of this my controller got burnt. SO what does it exactly do drawn more current ?

And how do you calculate that since in TIP 2 you mentioned the limit "Only 30 in this circuit" how did you calculated that?
pandyaketan (author)  samalert10 months ago
1. If you are using this (Part 1) AC circuit, then add a new capacitor for every 30 leds. If you are using the Part 2 DC circuit with full wave bridge rectifier, then a single capacitor will do.

2. Capacitor in Tip 2 is for AC mains circuit (0.22 uF, 400 Volt AC rating).

3.You have applied this tip wrongly for your car purposes. You have incorrectly used a "controller" of wrong rating, perhaps!

4. Calculation for 30 - mr "dipankar" has answered such queries in his instructables in great detail. You may like to see his work.

reg
ketan
Pandyaketan: Where can I get the material to make such a project, If possible can you name a place in New Delhi.
Maqsood.a3 years ago
Nice lamp. Have couple of doubts.
1) Which led's you u used?
2) If i keep it whole night how long the led losts?
Provide the diagram of led connection
I hade made one LED lamp where i used 19 led's, if i keep it on for 8 to 10 hrs after a couple of weeks led brightness will go it becomes very dull need to replace the whole led set. Please suggest wat need to be done to keep its brightness for longer time
pandyaketan (author)  Maqsood.a3 years ago
Thank you.

1) 5 mm white-green leds of 3.2v & 20 millliamp rating - the normal ones.
2) i use it everyday for 8 hours as night light, no damage to led or the lumen.
3) It is so simple, what diagram u require for 4 leds, if u yourself have made a 19 led bulb !!???

Connect a positive leg of one led to a negative leg of another. This is one pair of 2 leds. Make as many pairs as you wish upto 14.

The way forward, without getting into your erroneous bulb, is to discard it altogether and make one like this one (?)

Hope it helps...

reg
ketan
Thanks for ur prompt reply, i used 5mm doom leds of 3.2 - 3.4 20 milliamp rating.
I connected same in series ( connecting +ve leg to -ve even though the same problem need to change led's after 2 weeks of daily 5hrs use. I used 474k-400volts non polarity capacitor and1meg 1/4 watt resistor to drop voltage and 160v 47 uf polarity capicator. i tried by increasing resistor value also but in vain the led lumen will come down and last only for a couple of weeks.
I'm i doing any mistake? can u suggest me in this, i really looking for power efficiency.
Juxe Maqsood.a3 years ago
The reason LEDs do not last long is because of fluctuation in current and heat during extended use. Using a current-controlling (constant current) circuit will vastly increase LED life. LEDs produce heat, and when they do, the temperature change will cause their resistance and luminance to change. Using a voltage-controlling (constant voltage) circuit to power LEDs and limiting current with resistors will waste power in the resistor and allow the current to fluctuate, reducing the LED life. Most LEDs with controlled current should last 50k-100k hours, or whatever they are rated for.
pandyaketan (author)  Juxe3 years ago
True, but LED specs are out of context.

An LED, by itself cannot be directly connected to a 110VAC or 220VAC supply. it will burst, doesn't matter if it is designed for 50k or 100k hrs. it is designed to take 3volts only.

You have to understand - the circuit assembly becomes important to get the life it is designed for.

Any capacitor will not do. Any resistor will not do. The specs suggested here are "robust" for the lamp, full stop.

reg
ketan
pandyaketan (author)  Maqsood.a3 years ago
Dear Maqsood,

Why are you using just any capacitor!!???

1. Pl see the capacitor in the pic - the orange one. it is 0.22 uF (micro Faraday, not KF!!!) with 400 volt rating. I think it is made by Phillips company.

capacitor reduces the voltage from 230VAC to below 3V required by the LED. Higher rating will release more current and damage the LEDs.

2. I also dont understand why u use the polarized cap!!

3. Your wattage rating rating of 1/4 for the resistor is also wrong! it should be atleast 1/2 and better still 1k. Else it will give out smoke, burnout and also burn the leds.

You are lucky not to have caused an accident. Pl ensure that your knowledge always surpasses your enthusiasm! ;-D

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

Dear Ketan
Thanks for ur input. I Purchased the cap!! i asked for 0.22uf 400v instead he gave me 224 J 400v and said both are same. Is both cap value same can i use it?

lansang3 years ago
can i use a 600V .22uF capacitor instead? will that change anything?
pandyaketan (author)  lansang3 years ago
A 600 volt rating indicates that it can take higher loads safely. so i guess it should not be a problem...check it by putting it in your calculation sheets...

reg
ketan
BobS3 years ago
Perhaps someone can explain why a 22/ 47 uF capacitor can be used instead of resistors. I have even seen a schematic somewhere with lots of LEDs, parralel in both directions... What's the magic behind this?
pandyaketan (author)  BobS3 years ago
magicians never tell !! (about the voltage drop from 230v ac to 3 v by the 0.22 uF or from 110vac by the 0.47)

;-D

reg
k10
ray_Bond3 years ago
Its really bad to tell the half truth about " how to get these values of capacitor and resistors " so i give this information so that peoples can use and make their own coustom led for light setting this is the image info about AC light values with example. those who want to make any good led lights can use this formula and principle.
AC 220v LED light solution.jpeg
pandyaketan (author)  ray_Bond3 years ago
Very Good, Keep it up. But as you can see, my ckt is slightly different. Pl read again.
Dipankar3 years ago
You could keep the Resistor, Capacitor and wire connector in side a small plastic container so that it looks GOOD.
Open connection are always dangerous, a lizard can short circuit the connections.
pandyaketan (author)  Dipankar3 years ago
It is an honour to receive valuable guidance from "the LED Man" himself, sirji ! I will find an old pepsi bottle for covering !

Now for the joke ! Think of it as a lizard repellent ! Haha
reg
ketan