26
Nov
09

Building your own LED light Part 2

The end product.. Looks cheap, but its made mostly with recycled stuff.

(Continue from part 1…) Sorry for the delay.. was distracted by my other project.. the Yuloh oar making and testing took more time than anticipated.

Now that the LED circuit design is done and protyping is complete with satisfactory results, its time to make the fixture. In the spirit of being “eco-minded”, I try to use as much recycled stuff as possible.

The casing

I had 2″ x 3″ pieces of clear acrylic sheets left from a previous project that I use for a window, then I cut a piece of 1/8″ ply, same size as the acrylic window. Then, prepare strips of 1/8″ x 1″ corrogated plastic sheet for the edging and have some vinyl stickers handy by. ..

Or you might wanna use a casing from a old light fixture.. its easier.. 🙂

Layout plan using prefabricated PCB

Building the circuit

My placement differs from the diagram.

Here, I am using general purpose PCB board to build this circuit. 1st, plan the layout. My target board size (constrained by the 2″x 3″ window) is 1.5″ x 2.5″. Place the components on the board, arrange it as shown here. You can have your own placement ideas, just follow the design concept that I wrote about in part one, and keep in mind these 2 things below:

Look inside the lens. Supply positive to the smaller surface.

1) LEDs do have polarity. If you got it wrong, the LED could burn… so try to be careful about the placement. Inside the clear LED lens is a big plate and a small plate. The small plate should always be more positive than the big plate.

Pre-fab PCB board.

2).Lines on the PCB board are copper under green PVC preservative film and the bronze dots with holes in the middles are for pins of the component to stick thru and for soldering contact to the underlying copper strips. The lines on my layout plan correspond to these copper strips on the PCB. When making your layout plan, take these strips into consideration, like I did.

some electrical toos.

To successfully build this PCB, you will need some skills with soldering and have a few basic tools for cutting the board, trimming the leads… etc.

LED lightup testing. It works. Pretty nice huh.

LED light boxed up.

After soldering in the components, test it. Make sure it lights up before boxing it up.

And here is the box, all built up. On hindsight, I realize that I should have taken pictures of the box building … but was too eager to finish..

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Sailing 2015: Port Townsend(WA, US) -> Costes Island (BC, Canada)

Sailing 2013: Singapore -> Okinawa -> Kobe

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