UV Glass Hanging Nightlight/Whiteboard ( From Mobile Charger )

Today i Bought some Ultraviolet lights and i wanted to make something attractive. So i made another glass hanging nightlight! (I am still a beginner so sorry for the glass joint to wire)
My first Nightlight (with brightness control) :-
http://instructables.com/id/Led-Glass-Nightlight-with-Brightness-Control-v10/

Step 1: List of Parts

Parts Needed :-
(1) Ultraviolet(UV) Led
(2) USB Charger
(3) 100 Ohms
(4) Plastic Small Container
(5) Highter (Optional)
(6) Some Wires

That's all! :P

Step 2: Opening the Charger

Break open the charger.
Remove the wires from the charger pins and extend with a Wire which has to wires imbedded in it.

Step 3: Soldering and Hot Gluing

I Soldered wires to 5v and ground pins of USB.
Hot Glue the charger to Bottom.
Solder the AC lines to charger.(Warning: Always wear rubber gloves when working with AC lines,you can get a SHOCK of 250/110v)

Step 4: Attaching Led to Glass

Sorry for that Tape joint (you can hot glue it )
Hot Glue the Led to glass Top.
Horray! We just Made it!

Step 5: Attaching to Top

Drill Hole at Top for a Skrew
I Made a hole for skrew in the plastic Container.
One Skrew was enough for the container to stick to top tightly.

Step 6: Testing!

Perfect! Switch it on! Enjoy Making your Nightlight/Whiteboard with a simple Cheap Charger. :D
Now Pick up your Highlighter and Show your Creativity.
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Comments

[rajath]

Hi there! Awesome project. I am doing a similar project with LEDs.

I don't know much about electronics (Mechanical Engg) so please bear with me. Last week I went to the electronics market and some guy there told me to use a 47k ohm resistor in series with one LED and hook it up to a 220V AC supply (from the wall). I did that and it works!!! But unfortunately it works only for 3 LEDs max (in series).

Now I want to use the AC power supply to light up about 40 LEDs and I don't want to use a transformer. Can you give me a minimalist circuit diagram and if possible parts list to get this done.

Please can you tell me what values of resistors I am supposed to use so that I can light up all the 40 LEDs brightly.

Thank you for your instructable and thanks in advance for all replies

[Ayush Sharma]

Tell me the colour of led which you are using?...because different colors have different voltage.

[rajath]

First of all thanks for the very quick reply.

1.) Red LED (2V and 30mA I guess) in series on one circuit.

2.) Blue LED (4.5V and 30mA I guess) on another circuit.

40 LEDs of each. i.e. 40 red and 40 blue.

[Ayush Sharma]

Hi Bro,
For Red Leds :- Try a 6.6 kilo Ohms resistor( hight brightness or 6.8 kilo resistor (low brightness) and they should be of 3.5/4 Watt rating. And it gets extremly hot while dropping the voltage.so you should add a heatsink stick to resistor. This is for 40 red leds connected in series
( Donot use anyother value lower than these Valuses, burn the leds)

(Less brightness - Longer life of leds
High Brightness - Less Life
It's now upon you choose high or low)
For Blue Leds :- Try a 4k Ohms resistor ( high brightness) or 4.7k Ohms (.And same they should be 3.5/4 Watt rating resistor and added with good heatsink.
Good Luck for your Project..

But transformer is the best choice for me.... ( Not Much Heat and No Heatsink :D)
Donot forget rectifier diode at end (1N 4007)
I Hope there are no problems.. But if incase you got any problem.Reply/message me :)

[rajath]

Thanks Killerwhale!! Exactly what I needed..

And I can hook this up to the wall directly right?

And IF POSSIBLE, keyword "IF". Can u upload a two rough handwritten circuit diagrams for it? One with transformer and other for the what u have mentioned.

[Ayush Sharma]

First of all "yeah" you can hook it directly to Wall
And i will draw the diagrams tomorrow. :)

[rajath]

Sure no prob.. Thanks a LOT!! I mean it

[Ayush Sharma]

Hey bro! Here are your diagrams...
http://tinypic.com/r/1fh81v/8
http://tinypic.com/r/11ie7tu/8

Hope you mention my name if you are making a instructable of this :)

[rajath]

Sure bro!! I'd HAVE to put your name and I will! Thanks a lot again!

[Ayush Sharma]

I have sent you a Private message. Please see it :P

[Danger is my middle name]

Very cool! I like that you can use it as a whiteboard too!

[Ayush Sharma]

Thanks :)