20 January, 2015

Converting an owl figure on a practical table lamp using LED technology

Craft with LED: As you can see almost any object serves to build a LED lamp
Hello friends, we have seen above that the technology of LED lighting allows you to convert almost any object into a light source , which can unleash our imagination and surprise all and sundry with our creations.
This time I decided to make a very special gift to someone very special, while riding entertained me two 7W LED round (it's a type of aluminum plate on which the semiconductor diodes are used in 14 points per disc).

In a bazaar I noticed an owl by the size of their eyes and its shape well served me to do something original and useful; to be hollow could easily incorporate all the elements.

  • Basic electricity / electronics; scissors, cable, 40W soldering iron, duct tape, etc.
  • Epoxy glue two components recommend fast drying (5 minutes working time), we will use to put the pieces in place. In industrial sized leaves much cheaper in the long run.

  • Base element we want to convert to a lamp, in this case an owl .
  • LED Chips appropriate to the project, in this case I chose two round 7W COB 21 / 24V I feed below their possibilities (also not a matter of blinding you use it;).
  • A transformer  power to feed, I've only found one 18V AC which can serve, but we have to create the rectifier stage to feed the LED ( required CC ). To reduce size and power enter into the bowels of Buhito'll have to open it.

WARNING : While 18V not carry a risk of electric shock, the primary stage operates at 220V SO YOU MUST TAKE CARE OF WELL INSULATED CABLES AND NOT PLUG UNTIL EVERYTHING IS OK.
  • Cable with switch ignition off, it will take electricity to the transformer. Although originally was going to put one black in the end I opted for the gold, makes it more interesting.

  • And as always, safety comes first; utilizad gloves and goggles when using rotalín .


Begin by opening the eye area owl. When I bought it I thought it was plastic, but clay, making it quite fragile to work. He also result in a rather fragile bulb, we must be careful not to fall to the ground, making slip and adding weight (with the transformer will suffice). If you can, utilizad any tougher than the clay material.

I used a rotalín with a cutting disc to go wearing the edges and then with a soft blow open holes where Iran hosted the round LED.

The LED should go refrigerandos , in this case as feed them less than their rated power, with small heatsinks removed from halve a heatsink computer motherboard will suffice. Otherwise, you might need a 7W dissipate heat generated.

Iran housed in the hollow; We tried to fit in the gap before anything.

If available, proceed to soldarles cables (best of two different colors for positive and negative) cable coverage of high temperature silicone stand better, do not know what temperature can reach and thus avoid possible short circuits.

Exoxi stick with the LED heatsink plate . I have placed in the center, where the wires are soldered also glue to cover them and then paint as a center of the eye.

Once hardened check a presentation that does not hit the sink and there is room to "breathe" and heat can escape; if there not have to drill small holes in the top to facilitate it.

This is how it looks inside the sink; you have to put up with fins to maximize heat dissipation, because that is the optimal position thereof (the owl usually be feet).

We took the cables through the bottom of the owl, which has a gap and partially stick the LED in place. As you see I have already painted with permanent marker the center of the eye.

To give a more "buhil" aspect, I also stuck with loctite and held a couple of pieces of black wire with pliers (now seems to have glasses, but is more "mono").

Should check that the connections are well made, I made a test feeding the LED and everything is correct:

And only need to prepare the transformer with rectifier and power cord, and put everything inside owl to finish the job.

The rectifier is one of the most complicated parts for the electronics not know. Explain the details of the operation of a rectifier is not the purpose of this entry, inform internet understand not.Basically with the diodes rectify the signal to make it continuous, and 330uF capacitor (how much more better ability) eliminated almost all of the ripple signal.
It always accept any capacitor greater than those we handle voltages. In this case it is safe to handle voltage; 18V, so we can experience without great risk.

In electronics stores rectifiers have one very useful piece; I used recycled diodes and capacitor power supply and capacitor using the support I have welded all

As yet lit too, I added a couple of resistors  in parallel to reduce slightly the passage of current (amps) and not shine much:

To open the transformer I used my resorted rotalín 125W and a disc of sheet metal cutting.You have to go slowly and wear protective eyewear if the disc breaks, releasing hazardous pieces:

I had to make a hole to sufficiently transformer , to enter. Solder the wires to the transformer and protect joints with duct tape.

Once inside I placed padding to prevent movement of the transformer . Keep in mind that you can warm enough; the filling must withstand temperatures of 60 ° C and allow some ventilation.

To avoid slipping and go down, I placed adhesive sponge rubber feet; Thus besides the hole is concealed:

And with this we have the owl ready ... the owl ... or whatever comes to mind !!

Final note: The owl can dazzle because COB LED lighting focuses on the points where they are housed; if we want to improve the result we can add a pair of white to better blur light on the yellow zone led disks.

Happy crafting and DIY !!

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