Just print out this home-made PCB on a laser printer, unsolder a couple of LEDs and resistances, plug in a 5v power supply and you are almost done!
What do you need?
| Qty | Component |
|---|---|
| 6 | LED 5050 form any led light strip |
| 6 | 470 Ohm SMD resistors (from the same led light strip) |
| 1 | 5v DC 350mA power supply |
| 1 | Super Glue |
and a bit of basic soldering skills
This is intended to be a beginner project into led lighting and electronics, I used adobe illustrator to make a "quick" revised version of a project published at http://www.instructables.com/id/Make-your-own-LED-ring-for-dremel/ in 2015
I will leave the vectorized PCB here, WITH NO INTENTIONS to make it a schematic nor Gerber files it’s supposed to be a useful but 10 min project, so no advanced engineering software is involved, feel free to fork it, share it or change anything you don’t like
This is a really god project for electronic hobbyists
Using a heat gun, I desoldered the SMD leds and resistors from a 5050 led light strip, these 5050 leds have 3 diodes inside, the total current is 350mA for all the circuit (9 leds), and the input voltage is 5v and each resistor is 470 ohms, a bit or ironing the PCB and some drilling and sanding with my Dremel and I was done.
Just use Windows integrated print capabilities, you can print easily using windows and selecting the “pocket” size, remember to check the reframe image”
also make sure to
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Print out your design on a LASER Printer, an inkjet will not work, Glossy paper is the best to use
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Place your Board design on your copper clad board & iron it on the hottest temperature for about five minutes, just to be sure all the toner has been transferred.
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Place your board in cool water for a few minutes, then rub the paper off. You should be left with the design on the copper clad board.
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Etch the board. I use one part of hydrochloric acid diluted in five of hydrogen peroxide. it takes about 5 minutes to etch.
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Once your board is etched, remove the left-over toner. There are a few methods to do this. I use a mixture of steel wool (To get the toner off to a rough standard) then clean the board up with acetone to ensure there are no bits of toner on the board.
All the LEDs are in parallel, this way each one needs to have a separate current limiting resistor for each.
Otherwise you'll drastically reduce the lifespan of whichever of the nine LEDs happens to have the lowest forward voltage.
If you put them all in series, you can get away with a single resistor, but then you're working with fairly high voltages.
A good compromise may be to make strands of three LEDs in series with a resistor, and then to put three of those strands in parallel.
If you have any questions you can send me a message on my webpage vazeri.github.io and I´ll answer as soon as I can. This work is an open source, non-profit project under the MIT License