DIY Multimedia LED Projector (video manual)

Step 3 Placing the LED in the Heat Sink

The High Power LED needs to be placed on a Heat sink. The heat sink I'm using is not as big as I would like, that's why I added a fan to cool off the heat sink.

1.- Mark the holes where you'll fix the LED.

2.- Make the holes with the drill.

3.- Put some thermal paste grease.

4.- Fix the LED to the Heat sink.

5.- Find a way to fix the condenser lens later. ( I used some slide lens adapter that I had hanging around. You could use any plastic tube. Make the necessary holes for the cables)

6.- Solder the cables to the LED (Protect the LED before soldering. Pay good attention to the polarity, It should say it)


Here is the video of how I've done it.

Comments

[goldenshuttle]

Brilliant work...it makes one wonder why OHP's are so expensive...

[syed.ali02]

Dear Newton2
Can i use 23watt white light 2energy savers.It will produce more light than LED

[aekara]

hi again

i just want to ask if you can give me a link for the heatsink that you use

i only have two heatsinks but i dont know if they will work. The one is from an old video card and the other from a old computer processor

here are some pictures of the heatsinks and the led ...

[aekara]

hi newtonn :)

i was thinking about the how to power the led can i use this power suplly for the led and for the 12v voltage regulator only? i am going to use two power suplys

one for the led and the lcd monitor

and the other for the speakers and the fan

here is the link  http://cgi.ebay.com/BRAND-NEW-15V-2A-AC-DC-Power-ac-adapter-Power-supply-/130417842041?pt=LH_DefaultDomain_0&hash=item1e5d825779

[newtonn2]

Hi there!

I suggest you buy the LED driver.

The ac adapter on the link it's ok, but I don't trust it's going to provide the right voltage and amps for the LED.

[aekara]

the 30w led come to my home today and (just to try it) i connect it to a 12v 300mA power adapter and it works but i dont know if that is the maximum power for the led

[newtonn2]

It will be a lot brighter with the right driver. You need to supply 2000mA to see the maximum brightness.

[aekara]

could you send me a link for a cheap led driver?

 here is the link that i buy the led http://cgi.ebay.com/30W-White-High-Power-2100LM-LED-Light-Lamp-Bulb-A_W0QQitemZ220708010099QQcategoryZ163866QQcmdZViewItemQQ_trksidZp4340.m263QQ_trkparmsZalgo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D10%26pmod%3D220693236934%26ps%3D63%26clkid%3D5621333683761900258 

[newtonn2]

http://cgi.ebay.com/30W-AC-Power-Driver-30-Watt-LED-Light-Lamp-Bulb-A-/220709273292?pt=LH_DefaultDomain_0&hash=item33634c3ecc#ht_3595wt_962

[aekara]

thank you very much

[poweroflight]

I think i burnt out the led but i am not sure. My led did not have the polarities written on it. So i tried one way and it didnt work and then when i tried the other way the led was blinking (this was with the laptop charger listen in the materials). So i fiugured that it wasnt enough power and i tried it with a computer power cord and nothing happened. Then when i tried again with the original laptop charger it didnt work at all and the wires that i soldered are a little brown.

[newtonn2]

What tipe of LED did you use? did you made the LED driver? you can't connect the LED straight to the power supply if the voltage is not right.

[poweroflight]

i used the same led you had listed in materials. I just wanted to test it out. Do you think the led is burnt out or its just needs to be connected to the correct voltage? if so how else could i test the thing? Unfortunately i dont have a bench power supply, it should be my next project.

[newtonn2]

So the LED is rated 16v 1.8A. You should not connect it to a 20V 4.5A power supply. If you want to try it you should find a power supply of 16v or around that. A 15V power supply may be enough to try it.

It don't know if you can test if the LED is burn or not without the right power supply. I know I could not use the multimeter to check condition of my high power LED.

[poweroflight]

okay, i ordered another led... hopefully i wont make the same mistake as last time.. Im kind of jumping back and forth between this and the desk with the built in pc, otherwise i would go ahead and build the bench power supply as it would be very handy.

Do you know of any other lcd's this size that would have better resolution. I have been going crazy trying to find something a little better, even if it means i have to spend a little more.

[aekara]

Can I use a 20w 12 volt high power led instead of a 30w 18 volt ?

[newtonn2]

You could use it but it will not be as bright. You want it to be as bright as possible.

[aekara]

ok.i am going to buy a 30w led that works at 13.5/18 volt and 2 amp

[J_K]

First: Great project!
Second: I know it was already asked several times, but:
I bought a 7" display and now I want to know, whether I could use the 50W LED from the ebay sellers, like yours. Do you think it´s strong enough to make a good picture (the room would be nearly totaly dark)?
Want to use the lens of an old OHP and put the projector on in a distance of  ~3,5meters...

Sorry for bad english :P Greetings from Germany :D

[jj.inc]

Just don't go to big or you will washout your picture.

[newtonn2]

 
Thank you very much!  

 You could use the 7"screen with a 50w LED just fine. I think it will be good if the room is really dark of course.  In fact, I've seen that setting before, have a look at this link.

You could use the lens from an OHP with the 7" screen with no problems at all. You'll get a screen of approximate 2M diagonal.

Don't worry about your English, mine is bad too.

[jj.inc]

that LED looks just the right size to attach a CPU fan to, and they usually come with thermal paste.

[poweroflight]

 How large does the heat sink need to be.  The heat sink you use in the video seems to be larger than any of the ones i have on hand, yet you say it is small. 

Thanks for your help,
Francisco

[newtonn2]

 Can't you find a old computer processor heatsink? it could be smaller than mine if you have more ventilation. Maybe run the fan at 12v instead of 5v like mine.