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Picture of Homemade laser pointer
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Last week i purchased a laser pointer for my little brother, I told him to be careful with it. Two days later, he opened the laser and broke it, he was sad and i decided to make a new one.
I started to look for instructables about laser pointers and there were laser drivers, laser burners, laser spirographs... But no simple pointers from dvd readers laser diodes (i didnt want to buy a new laser on the internet and in my small city i didnt find any).
Then i decided to mix all instuctables i saw to make a easy laser pointer with some recycled materials. (I didn't made it able to burn because it is mainly for my brother)

Enjoy that instructable and make your own laser.
 
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Step 1: Materials

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What i needed to make that laser is:
- A laser diode, I used visible red diode, but you can use the color you want (or the one you have)
-LM 317 voltage regulator
-2x 10ohm 1/2w resistors
-1N4001 or somilar diode
-One 100nF capacitor
-A 100ohm potentiometer
-A push button
-The PCB (step 2)
-A case (step 4)
-A focusing system (steps 5 & 6)
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Orngrimm2 years ago
Schematics?
pinomelean (author)  Orngrimm2 years ago
Done
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.
Think of it like a small solar cell inside the laserdiode which gives you voltage in a function of laserpower.

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...
thismatters10 days ago

According to my understanding of the LM317, the other end of the potentiometer should be connected to ground.

pinomelean (author)  thismatters10 days ago

I'm not using it as a voltage regulator, but as a current source.

Okay, in that case shouldn't the resistor be in series with the load? Several sources cite that as the way to implement a current source using an LM317.  It is hard to argue with your results; the laser pointer works. However, I'm at a loss to explain how your circuit works.
pinomelean (author)  thismatters10 days ago

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.

I actually have little idea of what this particular circuit is doing. But it works.

DanielM3411 days ago

Robaron tus imagenes y las expusieron en

They stole your images and presented here as your own, you can go to the site and report copyright ... greetings

http://www.taringa.net/post/info/18742491/Como-hac...

pinomelean (author)  DanielM3410 days ago

He/she took the effort to traduce my article and added a link to this instructable, i'll just let it be.

Thanks for the warning, though!

Use téminos first person is taking and misleading others as his own their work despite having the link to this page ..

spitfire12342 months ago

does it burn

pinomelean (author)  spitfire12342 months ago

No, it uses a 5mw diode.

spitfire12342 months ago

hi

spitfire12342 months ago

does it burn

nilanjanduke 4 months ago
is this burning laser?
Wiebejamn7 months ago

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

pinomelean (author)  Wiebejamn7 months ago

Yhe pcb is listed under "copper clad" on ebay.

The regulator was a regular lm317 in to-220 package, but i cut off the metal part.

hdfilmsitesi7 months ago

vay anasısı süper

kavehazeme8 months ago
tanks
baecker0311 months ago

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.

FYI for the housing, aluminium, brass, or copper would be ideal candidates... although aluminium is more fragile, and brass is less heat conductive.

pinomelean (author)  baecker0311 months ago

I made this for that same purpose, not the best materials, but easy,cheap and efective.

http://www.instructables.com/id/Homemade-laser-module/

can I use this dvd burner diode for laser engraving on paper and plastic material??

how long does the battery lasts ?

pinomelean (author)  aniket virkar1 year ago
With the diode at 50mA, it can last 6h
bneo991 year ago

How long does the battery last?

pinomelean (author)  bneo991 year ago
I haven't tested it, but i think it can last about an hour and a half...
Nixylix921 year ago

hey there, is it possible to use the laser from a PSP lense?

pinomelean (author)  Nixylix921 year ago
I think they need a different voltage.
aspina251 year ago
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.
Thank you,

Aspina25
pinomelean (author)  aspina251 year ago
Maybe a 3.3ohm one?
Where did you get the stuff????
pinomelean (author)  stevenator20001 year ago
The laser diode was from a dvd reader (burners are more powerful) the componesta were both from old boards and from ebay.
DragonDon1 year ago
Truly a James Bond moment here! Cool.
Nitroxium1 year ago
Yo,I have a lens used in laser and a really powerful bulb.Will you folks help me in making a laser outta it?
i really wanna make this... i just dont have the electronic components -___-
edvin19941 year ago
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
THEFORREAL1 year ago
Great a 9 Volt battery is "three AAA's". Aside from that it kinda reminds you of a "Zippo" 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.
edvin19941 year ago
what size pcb need to be
pinomelean (author)  edvin19941 year ago
About an inch wide an as long as it still fitting into the battery.
If you're using anothes casing, it can be bigger.
edvin19941 year ago
can u pls say what are u using and what can i use for lens and laser to place pls
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