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) :-

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
<p>Hi there! Awesome project. I am doing a similar project with LEDs.</p><p>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).</p><p>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.</p><p>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.</p><p>Thank you for your instructable and thanks in advance for all replies</p>
Tell me the colour of led which you are using?...because different colors have different voltage.
<p>First of all thanks for the very quick reply.</p><p>1.) Red LED (2V and 30mA I guess) in series on one circuit.</p><p>2.) Blue LED (4.5V and 30mA I guess) on another circuit.</p><p>40 LEDs of each. i.e. 40 red and 40 blue.</p>
Hi Bro, <br>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<br>( Donot use anyother value lower than these Valuses, burn the leds) <br><br>(Less brightness - Longer life of leds<br>High Brightness - Less Life <br>It's now upon you choose high or low)<br>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. <br>Good Luck for your Project.. <br><br>But transformer is the best choice for me.... ( Not Much Heat and No Heatsink :D)<br>Donot forget rectifier diode at end (1N 4007)<br>I Hope there are no problems.. But if incase you got any problem.Reply/message me :)
<p>Thanks Killerwhale!! Exactly what I needed..</p><p>And I can hook this up to the wall directly right?</p><p>And IF POSSIBLE, keyword <strong>&quot;IF&quot;. </strong>Can u upload a two rough handwritten circuit diagrams for it? One with transformer and other for the what u have mentioned.</p>
First of all &quot;yeah&quot; you can hook it directly to Wall <br>And i will draw the diagrams tomorrow. :)
<p>Sure no prob.. Thanks a LOT!! I mean it</p>
Hey bro! Here are your diagrams...<br>http://tinypic.com/r/1fh81v/8<br>http://tinypic.com/r/11ie7tu/8<br><br>Hope you mention my name if you are making a instructable of this :)
<p>Sure bro!! I'd HAVE to put your name and I will! Thanks a lot again!</p>
I have sent you a Private message. Please see it :P
<p>Very cool! I like that you can use it as a whiteboard too!</p>
Thanks :)

About This Instructable


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Bio: Just a Small Tinkerer ;)
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