Step 8: Done!

The laser pointer war finished and ready to use, my little brother is now happy with it's new pointer and the cats in the street :3.
The laser reaches 150ft if you focus it well and it is about 5$ in materials and made by yourself!

If you liked my instuctable, please, vote me in the Epilog laser, pocket-sized electronics and battery powerwed contests.

If i win the laser cutter, thing that probably will not happen, I'll use it for engraving everithing i can, for cutting gears, cases, 123D kits... It would be totally awsome!

Feel free to ask me anything you didn't understand or propose upgrades.
Thanks. Now I see why I thought it was too simple: you simply drive the diode with no feedback. That's what normally the 3rd pin is for (as you asked). From this pin you can read back the laserpower.<br>Think of it like a small solar cell inside the laserdiode which gives you voltage in a function of laserpower.<br><br>Honestly I think you don't need that here since you don't need to compensate the few microwatts dropped in laserpower due to heating and such...
<p>does it burn </p>
<p>No, it uses a 5mw diode.</p>
<p>would it burn if i had used a diode from lets say a dvd burner</p>
Yo,I have a lens used in laser and a really powerful bulb.Will you folks help me in making a laser outta it?
<p>It would not work because a laser diode does not produce light light a bulb, it concentrates light into a beam which is why they are dangerous and powerful. On the other hand, a bulb will produce light waves in a scatter and not a beam.</p>
<p>Do I need a potentiometer if I am going to keep it on max current? I want to make this I just don't want to spend an extra $3 for 20 100&Omega; trimpots (yes i know my schematic will be different) and have an extra 19. Can i substitute it with a jumper wire or make the connection solid?</p>
<p>According to my understanding of the LM317, the other end of the potentiometer should be connected to ground.</p>
<p>I'm not using it as a voltage regulator, but as a current source.</p>
Okay, in that case shouldn't the resistor be in series with the load? <a href="http://diyaudioprojects.com/Technical/Current-Regulator/" rel="nofollow">Several sources</a> <a href="http://theparanoidtroll.com/2011/01/05/constant-current-sourceload-lm317/" rel="nofollow">cite that as</a> <a href="https://en.wikipedia.org/wiki/LM317#Current_regulator" rel="nofollow">the way to implement</a> <a href="http://users.telenet.be/davshomepage/current-source.htm" rel="nofollow">a current source</a> <a href="https://www.circuitlab.com/circuit/22fpvp/test-lm317-current-source/" rel="nofollow">using an LM317</a>.&nbsp; It is hard to argue with your results; the laser pointer works. However, I'm at a loss to explain how your circuit works.<br>
<p>Yeah, you're right, i used this circuit i found in other pages when i had no idea of how it worked, and now i would use a different one.</p><p>I actually have little idea of what this particular circuit is doing. But it works.</p>
<p>Robaron tus imagenes y las expusieron en </p><p>They stole your images and presented here as your own, you can go to the site and report copyright ... greetings</p><p><a href="http://www.taringa.net/post/info/18742491/Como-hacer-un-puntero-laser-paso-a-paso.html#comment-1433690" rel="nofollow">http://www.taringa.net/post/info/18742491/Como-hac...</a> </p>
<p>He/she took the effort to traduce my article and added a link to this instructable, i'll just let it be.</p><p>Thanks for the warning, though!</p>
<p>Use t&eacute;minos first person is taking and misleading others as his own their work despite having the link to this page ..</p>
<p>does it burn</p>
<p>wow. It is quite fantastic idea to make this home made laser pointer. I have only used very low powered blue laser pointer from <a href="http://www.berlinlasers.com/" rel="nofollow"> http://www.berlinlasers.com/ </a> </p><p>It is quite nice job to make such great DIY laser.</p>
is this burning laser?
<p>Where did you get your PCB? That's the only part im struggling with. Also, the voltage regulator I bought at radio shack is huge in comparison to yours and there no way it will fit in the battery case</p>
<p>Yhe pcb is listed under &quot;copper clad&quot; on ebay.</p><p>The regulator was a regular lm317 in to-220 package, but i cut off the metal part.</p>
<p>vay anasısı s&uuml;per</p>
<p>one thing which I would love to see is more detail in focusing the laser. At the moment I am looking to build some laser measuring equipment for some projects without having to drop the exorbitant amount of money which these things cost. </p><p>FYI for the housing, aluminium, brass, or copper would be ideal candidates... although aluminium is more fragile, and brass is less heat conductive.</p>
<p>I made this for that same purpose, not the best materials, but easy,cheap and efective.</p><p>http://www.instructables.com/id/Homemade-laser-module/</p>
can I use this dvd burner diode for laser engraving on paper and plastic material??
<p>how long does the battery lasts ?</p>
With the diode at 50mA, it can last 6h
<p>How long does the battery last?</p>
I haven't tested it, but i think it can last about an hour and a half...
<p>hey there, is it possible to use the laser from a PSP lense?</p>
I think they need a different voltage.
i was wondering if there would be a good substitute for the 10-ohm resistors, seeing as the Radio shack in my town does not carry them. <br>Thank you, <br> <br>Aspina25
Maybe a 3.3ohm one?
Where did you get the stuff????
The laser diode was from a dvd reader (burners are more powerful) the componesta were both from old boards and from ebay.
Truly a James Bond moment here! Cool.
i really wanna make this... i just dont have the electronic components -___-
can i use a normal dvd diode or it need to be a dvd burner diode and do i need pcb board or can i use copper strings
Great a 9 Volt battery is &quot;three AAA's&quot;. Aside from that it kinda reminds you of a &quot;Zippo&quot; lighter. So,I Was thinking the Zippo would be very cool looking Laser and thinking it would be nice to have a Laser in a package that size maybe the length of the two halfs of the zippo case together.
what size pcb need to be
About an inch wide an as long as it still fitting into the battery.<br>If you're using anothes casing, it can be bigger.
can u pls say what are u using and what can i use for lens and laser to place pls
I used a threaded tube from a potentiometer and it's nut for focusing, a piece of brass tube to hold the nut, the lens was from the same DVD burner sled... &iexcl;Improvise it!
where to find the parts -LM 317 voltage regulator <br>-2x 10ohm 1/2w resistors <br>-1N4001 or somilar diode <br>-One 100nF capacitor <br>-A 100ohm potentiometer <br>-A push button
You can look for them in radioshack, ebay, jameco...
is the laser beam in air visible <br>where can i find potentiometar at home
The semi-infrared diode that i used is not visible in clean air. But there are some red diodes (totally red) that are more shini with the same power.

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Bio: I love electronics and all about DIY.
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