Introduction: Homemade Laser Pointer


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.

Step 1: Materials

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)

Step 2: The Driver

To make a proper driver for the laser diode, etch the PCB and solder the components as shown in the diagram.

Some people only connects the LD with a resistor in series, but that driver is a better (but more expensive) way to use a laser diode.

The LM371 varies the voltage the LD uses (i cutted the top because it didnt overheat, i think i does not affect the way it works), the two 10ohm resistors in parallel set the maximum voltage and current the Laser Diode will get, the pot allows adjustment of output current, The 1N4001 diode protects the LD from a negative input as battery placed wrong, but LM317 can't deliver neative voltages, so maybe it is not necessary, and the capacitor protects laser diode  from immediate  power supply especially when switching on.

This driver is a mixture of what i have seen arround, so, if something should not go there, please tell me.

Step 3: Plug to Battery

I had an old battery, and when i thought i was going to use a 9v battery as power supply, i decided to use this one as case and plug.
After you open it, if it is new, use the batteries inside, don't throw them!

I soldered the battery plug to the circuit input, making sure it was correctly polarized.

Step 4: The Casing

As i've said, i used the old battery as a case for the driver, i sanded it and i drilled some ventilation holes because i cutted the top of the LM317 regulator.
Maybe you like to give it a paintjob, but i decided to leave the metal polished.

Step 5: Laser Housing

That two steps are a guidance for you, because i used parts that i had on hand, that sure you don't have, you have to improvise, or buy a laser housing with its lens.

Step 6: Focusing System

For the focusing system i used a potentiometer threaded part and its nut and a salvaged lens from the dvd reader.
It is not perfect but it focuses the beam ad it's free!

Step 7: Putting It All Together

I connected the driver to the laser diode and after making sure it works, i insulated the driver with tape, i introduced it into the case and i glued it to prevent pulling it out with cyanocrylate, But epoxi would work better.
The laser housing was hot glued making a diode replacement easier.

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.
Bye.

Comments

author
Orngrimm made it!(author)2013-06-05

Schematics?

author
CarlosD32 made it!(author)2015-10-08

http://www.taringa.net/post/info/18742491/Como-hacer-un-puntero-laser-paso-a-paso.html#comment-1433690

author
nstoik made it!(author)2016-07-10

Bien ahí los taringueros!

author
jorgeariel.castillo made it!(author)2016-07-12

Vamos los taringeros! por fin algo de inteligencia colectiva

author
pinomelean made it!(author)2015-10-08

It's ok if they use it, they have icluded the link to the source.

author
pinomelean made it!(author)2013-06-05

Done

author
Orngrimm made it!(author)2013-06-06

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...

author
sappalangi made it!(author)2017-01-07

Hi guys, I got a laser diode from my DVD writter drive.before making the driver circuit I just want to check the laser diode is working or not .so I checked with a multimeter using diode mode.there is no light rays multimeter shows the value 1702 but no beep sound.is that spoiled? Plz help me

author
sappalangi made it!(author)2017-01-07

Hi guys, I got a laser diode from my DVD writter drive.before making the circuit I just want to check the laser diode is working or not .so I checked with a multimeter using diode mode.there is no light rays multimeter shows the value 1702 but no beep sound.is that spoiled? Plz help me

author
tvan+reeuwijk made it!(author)2016-04-08

What materials do you need to have to make it run on a 3.7 battery?

author
The_Doer_Of_Things made it!(author)2016-01-20

how much will it cost. i have none of the materials

author
spitfire1234 made it!(author)2015-05-04

does it burn

author
pinomelean made it!(author)2015-05-05

No, it uses a 5mw diode.

author
TURKEYBUZZARD101 made it!(author)2015-07-23

would it burn if i had used a diode from lets say a dvd burner

author
Nitroxium made it!(author)2013-10-04

Yo,I have a lens used in laser and a really powerful bulb.Will you folks help me in making a laser outta it?

author
TURKEYBUZZARD101 made it!(author)2015-07-23

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.

author
TURKEYBUZZARD101 made it!(author)2015-07-23

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 100Ω 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?

author
thismatters made it!(author)2015-06-25

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

author
pinomelean made it!(author)2015-06-25

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

author
thismatters made it!(author)2015-06-25

Okay, in that case shouldn't the resistor be in series with the load? Several sourcescite that asthe way to implementa current sourceusing 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.

author
pinomelean made it!(author)2015-06-26

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.

author
DanielM34 made it!(author)2015-06-25

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...

author
pinomelean made it!(author)2015-06-25

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!

author
DanielM34 made it!(author)2015-06-25

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

author
spitfire1234 made it!(author)2015-05-04

hi

author
spitfire1234 made it!(author)2015-05-04

does it burn

author
nilanjanduke+ made it!(author)2015-02-12

is this burning laser?

author
Wiebejamn made it!(author)2014-12-04

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

author
pinomelean made it!(author)2014-12-05

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.

author
hdfilmsitesi made it!(author)2014-11-15

vay anasısı süper

author
kavehazeme made it!(author)2014-10-11

tanks

author
baecker03 made it!(author)2014-07-18

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.

author
pinomelean made it!(author)2014-07-18

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

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

author
das1233444 made it!(author)2014-09-22

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

author
aniket+virkar made it!(author)2014-04-01

how long does the battery lasts ?

author
pinomelean made it!(author)2014-04-01

With the diode at 50mA, it can last 6h

author
bneo99 made it!(author)2014-02-02

How long does the battery last?

author
pinomelean made it!(author)2014-02-02

I haven't tested it, but i think it can last about an hour and a half...

author
Nixylix92 made it!(author)2014-01-28

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

author
pinomelean made it!(author)2014-01-28

I think they need a different voltage.

author
aspina25 made it!(author)2013-11-02

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

author
pinomelean made it!(author)2013-11-02

Maybe a 3.3ohm one?

author
stevenator2000 made it!(author)2013-11-01

Where did you get the stuff????

author
pinomelean made it!(author)2013-11-01

The laser diode was from a dvd reader (burners are more powerful) the componesta were both from old boards and from ebay.

author
DragonDon made it!(author)2013-10-06

Truly a James Bond moment here! Cool.

author
Ragingwasabi made it!(author)2013-10-02

i really wanna make this... i just dont have the electronic components -___-

author
edvin1994 made it!(author)2013-08-17

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

author
THEFORREAL made it!(author)2013-08-11

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.

author
edvin1994 made it!(author)2013-07-26

what size pcb need to be

author
pinomelean made it!(author)2013-07-28

About an inch wide an as long as it still fitting into the battery.
If you're using anothes casing, it can be bigger.

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