Can you connect lasers and LED's?

Can you connect LED's and lasers in a series/parallel circuit with a transformer? How would the math work to figure out what kind of resistors I need? Keep in mind I am a beginner when it comes to LED's and no almost nothing about lasers. Just trying to figure this stuff out for some home projects. Any help would be amazing =)

Posted by kturner13 7 years ago

slimline ps2

Hey all.  im new here, so forgive me if this question has already been asked. I have an old, slimline ps2, and i was wondering if there was anything i could do with the laser that reads the disks?  it kinda looks like the laser from an XBOX 360, so can i do the same projects with a ps2 laser?  Or are there any other already existing things that i can do with it, specifically with the laser diode? thanks for any help! --knightly insane

Posted by knightlyinsane 8 years ago


Hello,  I do not know very much about electronics in general but I would like to make a circuit that allows me to run a group of " LED "  lights, maybe ( 6 to 8  ) in PARALLEL.  I would also like to do the same for hand held " Lasers "  ( 3 to 4 ) in PARALLEL. To make it more complicated, I would like to be able to use the same power source to run both groups at the same time. I would like to be able to turn either group on or off independently while using the same power source. The power source will either be --2  D cell -- or -- 4 AA -- batteries. Normally each LED uses 3 hearing aid batteries. This is the same for each LASER pointer. I think each hearing aid battery is about 1.5 volts but Im not sure what the amperage is. I would like to do it as simple as possible. I hope I can get all of the parts at Radio Shack. I have no idea where to start, any help would be appreciated !

Posted by I Need To Know 7 years ago

Observing single photons (may be future Instructable)

In a thread on building a DIY Geiger counter, I mentioned that it's possible to do an experiment to see single photons directly with your eyes. This is a lab we did when I was an undergraduate, more than 20 years ago. I haven't done the setup myself since then, so I'm just going to describe it; if I have the opportunity run it again, then I'll make an I'ble.If someone else decides to tackle it, please feel free to write it up yourself!The human eye detects light via a family of proteins called opsins. Different forms of photopsins are sensitive to different wavebands, which is what gives us color vision. Rhodopsin is sensitive mainly to greenish-blue light, and provides us with monochromatic night vision. Rhodopsin works by changing its conformation when it absorbs a photon; that change of conformation allows ions to flow through the rod cell's membrane and generate a signal. The signal from each rod cell is processed through the retina and passed to the visual cortex, where a representation of the visual field is constructed.Human rhodopsin has a quantum efficiency of about 25% (there's a 25% chance a single photon will be absorbed and produce the rod-cell signal). By comparison, cat rhodopsin is more than 90% quantum efficient. 25% QE is sufficiently high to be observable -- a source of single photons can be seen by a dark-adpated person with normal vision.You'll need a steady source of well-collimated photons. A green laser pointer (~532 nm) will do nicely. But how many photons does it generate? A wavelength of 532 nm corresponds to 3.53×10-19 joules. So a small 1mW laser pointer puts out 2.8×1015 photons per second (watt = joule/s). How do you reduce that to one photon at a time? With filters. An ND3 neutral density filter reduces the output light by 10-3 compared to the input, so a stack of just five ND3's in front of this laster pointer would result in (on average) just 2.8 photons per second! A stack of four ND4's would give you 0.28 photons/s on average.If you don't have neutral density filters, you can make a decent approximation, by stacking sheets of black trash-bag plastic. To make this work you have to measure the attenuation yourself, so you'll need a photodetector, something which gives an output (voltage, resistance, current, whatever) proportional to the intensity of light.Once you have your single-photon source, you need to set it up in a completely dark room. If you have access to an old-style photographic darkroom, use it. Otherwise, use thick (3-5 mm) black felt and gaffer's tape to seal any windows and doorframes. Put the laser on a table or stand pointed at your face, with the stack of NDs (or trash bags) in front of it. If you're doing this by yourself, you may want to have a piece of tape set up to hold the pointer's button down. Otherwise, your lab partner will take care of it.Sit in the dark for 20 to 30 minutes. This will seem like forever, so you may want something to help you keep track of the time. A standard CD will be about half finished, or you can get through ten pop sons on your iPod, when your eyes become dark adapted.Turn on the laser. You'll see intermittent flashes all coming from nearly the same place in your visual field; if you turn your head, the location will move in the opposite direction. If you've used filters to get down to a few flashes per second, POV will make them easier to see. At less than one photon per second, you'll see them individually.

Posted by kelseymh 9 years ago

Laser soldering

So im making a  laser spirograph ( and i just got my laser diode to come out of its case, and i was wondering where i should solder the red and black wire as it does not look like the one in the 'ible. the laser diode looks like this one here http://10mW 532nm Green Laser Module (3V 11.9mm)  (i would take a pic of the diode but i cant find my camera!) the only difference in the diodes is that mine has a black button instead of the red. Oh and one more thing is that it has to bypass the use of the button. Thanks in advance!!!!!!!!

Posted by Mr. walrus 6 years ago

5 5mw lasers powered by one 120V outlet

Any comments or advice on making this happen? Im looking at buying five of these.... hooking them upto a wall transformer off of a 120V outlet.

Posted by mnc615 9 years ago

WickedLasers Unleashes 1w Blue Laser Upon the Masses, or All Your Lightsaber Dreams Have Been Fulfilled

The good folks at Wicked Lasers unveiled their latest handheld high power laser: the Spider III Pro Arctic packs a blistering 445nm, blue, 1W beam that can SET YOU ON FIYAH for a mere $197.97. Wait wasn't the last one like 2 grand? Yup. Go check it out yourself, the website is loading slowly, presumably trampled under cyber foot as loads of people go to drool and purchase theirs. I'll wait. ... Yeah, it is real. Yeah, I want one too. Lasting 2 hours on a single charge, and sporting a scifilicous anodized aircraft aluminum body, this beauty packs quite a punch, apparently it is capable of setting bare flesh on fire almost instantly. Ouch. Now I REALLY want one. Who needs a gun when the tactical laser will make any offender scream and run away?

Posted by KentsOkay 8 years ago

ignition lasers

Does any one happen to have an oxygen Iodine Laser by any Chance?? If so tell me how u made it...tnx a bunche...

Posted by pyreoutof 10 years ago

Full Spectrum Lasers

Hey Everyone, Recently I have been looking at different C02 laser manufacturers to see if there was anything that was affordable but still of professional quality, and I stumbled accross Full Spectrum Lasers.  I am wondering if anyone on the site has any experience with their products and their customer service. The reason I am asking is because their prices almost seem too low; comparable Epilog lasers seem to cost at least twice as much.  I know that Epilog is probably one of the biggest names in the industry and have apparently been around the longest, but I don't see how that alone could cause such a price difference. So basically, if any of you have had good or bad experiences with Full Spectrum your knowledge would be greatly appreciated. Nathanael Scheffler

Posted by NathanaelScheffler 4 years ago

How do I go from 6V to 5V?

Hello there helpful forum! I have this costume I'm making for halloween. I'm using LEDs and lasers and things, and I'm a real new guy to electronics in general. I have a problem because I can't use the AC adapters that they come with for power. I need to have a simple way to make this battery powered so that it's portable. The AC adapters provide 1500mA of power at 5V. What is the simplest way to make (or buy) a portable battery system? It needs to be only a couple of pounds in weight, at most. I have these big 6V lantern batteries. What's the simplest way to drop the voltage to 5V? Also I don't have time to order any thing by mail. Can anyone help? Thanks so much!

Posted by Cactopus 6 years ago



Posted by KEYBOARDISBROKEN 9 years ago

Laser Tag Hacking

I've been toying with this idea for a while, but I can't go anywhere with it until I get some programming experience (I'm taking a class on it next year, so I'll be able to do it then). I was thinking of this as a potential way to cheat at laser tag (or make it more interesting at least). get a microcontroller, a photoresistor, and plenty of cheap laser diodes with collimators, lenses, etc (a bunch of cheap laser pointers would work for this). use the photoresistor to have the microcontroller "learn" your laser's signal (so that you can get credit for your tagging), and then reproduces that signal at the press of a button. put all the lasers facing outward in a ball and presto, a laser tag grenade. just wondered if anyone could think of a good way to do this.

Posted by codongolev 7 years ago

Laser scanner laser diode

Can I extract a laser diode from a scanner. If so will it be as strong a if I got one from a DVD burner/player?

Posted by laserblast 10 years ago

how to turn a laser pointer into a laser cutter?

Does any one know how to turn a regular laser pointer into a laser that will burn somthing when you point it at it?

Posted by DELETED_DELETED_kruser495 11 years ago


Dream Box of Goodies? I have a box full of circuit boards, motors, gears, lasers, power supplies, LED displays from several VCRs and DVD players, as well as internal parts from a DirecTV DVR with Tivo (not including the hard drive). All circuit boards contain chips, resisters, capacitors, etc intact on the boards. If you have interest in this or can point me to a place where I can get some value out of this lot, please let me know. Would most like to sell all together, but will consider selling piece-by-piece. Or maybe someone could direct me as to what parts to salvage. At this point, I have removed the boards and mechanics from the the enclosures in order to save space. I have recycled the steel/plastic enclosures. I am in the Dallas, TX metropolitan area. I would appreciate any offers or constructive advice.

Posted by aw0 7 years ago

Laser pointer upgrade

Can anyone help me find any way to upgrade a simple laser pointer to a burning laser?

Posted by randomperson 10 years ago

conwerting a laser

I have a guide line laser want to convert to laser cuter if it is possible need help the laser is CARTER MODEL#LGL-100S SERIAL#573 MFD JAN 1982 THIS LASER PRODUCT COMPLIES WITH DHEW/BRH RADIATION PERFORMENCE STANDARDS 21CFR SUB-CHEPTER J 120VAC

Posted by drgeorge 9 years ago

Laser help

Does any one know how to make or where to get a Argon Fluoride discharge pumped excimer laser or a laser with a 193nm output? I do believe that they are used in dentistry.

Posted by Masterdude 8 years ago

Laser RC car

Something along these lines...

Posted by PKTraceur 9 years ago

Laser Height Gauge

Hello, I wanted to know if there was a way to build a laser height (measurement) gauge that can measure to .001 or .0001?

Posted by vash399 7 months ago

Where can you buy laser diodes and circiut drivers ?

Laser DIY didn't send the parts we needed do you know where else to get  laser diodes and circiut drivers for the cheapy lighter laser burner ?

Posted by saltwaterfarmtoo 8 years ago

Laser diode

I need a laser diode from 18x or more dvd writer or blue-ray writer.please help me.I dont have a credit card to buy them from e-bay

Posted by Rhsameera 9 years ago

1.5W Green Laser

Hi everyone. I'm selling my 1.45W (metered) green laser; unfortunately I'll never get around to building a laser harp with her :-/ I'd like to get $800 for it, but this is somewhat negotiable.

Posted by grenadier 6 years ago

Efficacy of cheap laser pointer optics

Are cheap laser pointer optical units suitable for adapting with high powerlaser diodes from DVD-RW drives. I don't have access to internet transactionsso I can't get a laser module.

Posted by volthead 8 years ago

Arduino Laser Shield

H, there are kits available from here -

Posted by Bitline 7 years ago

ebay laser pointer scam

Ebay is scamming people when they buy laser pointers. This video outlines the scam

Posted by grannybasher 11 years ago

Laser cutter party!

Here's an awesome idea - host a laser-cutter party. Somebody with a laser cutter lets people bring their ideas and designs to make and show off. At this one in New York, they even made the snacks on the cutter...

Posted by Kiteman 8 years ago

1 watt Frequency Doubled Violet Laser

I want to make a 1 watt violet laser, by using a 1 watt 808 nm laser and channeling the laser through a KTP crystal. Judging from my humble knowledge of second harmonic generation, That should create a 1 watt violet laser beam. Correct?

Posted by Nexoid 8 years ago

Laser cutter

I was wondering where people in the UK get there laser cutting done? Every other instructable worth doing seems to be done on a laser cutter. so where might i be able to get some work done?

Posted by stupidityisanart 6 years ago

laser pointer

I own a RadioShack laser pointer (green beam) Can I hack it to burn a ballon? if so, how can i do it? Thank you.

Posted by danzarjoe 10 years ago

laser power controll modification

I was thinking, Is there any component that controlls the amount of electricity entering a laser diode? If there is can you replace/short circuit it inorder to make your laser more powerful and hopefully burning? thanks, Fidgety

Posted by fidgety2 10 years ago

solar light to laser beam ?

Hello, would it be possible to concentrate solar light so to form a laser beam ? In other words would it be possible to apply laser light principles to basic solar light with the help of optics of some sort ?

Posted by gabdab 8 years ago

Simple crosshair laser level pointer

Is there something or someone here that can tell me how I can make a one or two laser pointer into a crosshair laser level? 90 degrees on all sides

Posted by elkaddalek 1 year ago

What would you make with a EPILOG Zing laser?

What would be your first or favorite thing to make with an EPILOG Zing laser?

Posted by nepheron 9 years ago

Networking using laser

Hi, I wanna connect two PCs using laser ,can u suggest me anyting?

Posted by sush_d 11 years ago

a thought.

I was wondering if you could change a red light laser pointer to a green light laser pointer.

Posted by foxtrot4697 10 years ago

How to project a shape through laser pointer/projector

Hello,  I want to project this specific shape of rectangular with laser. Something similar to what Laser keyboard does, except I don't need all that complexity. Or it's something similar to laser pointer heads with different design patterns.  Please let me know if you have any suggestion. I would like to do this on my own as much as I can. Thank You!

Posted by shili13 3 years ago

Frequency of Laser Tag guns

Does anyone know if Laser tag guns use infared LED's emitting at a certain frequency, If so what frequency/range of frequency

Posted by thermoelectric 10 years ago

Laser Pointer Custom Lens Image

Was wondering if anyone has info on making a custom 'lens' for a laser pointer. Not sure what it's called, I just say lens [the piece responsible for making the laser beam into a star, crosshair,  or whatever]

Posted by Sovereignty 6 years ago

Laser Pointers

Hey guys, I was just wondering, if you had the money, what kind of laser you could buy and why.  Just a random thing I thought of after seeing the laser contest.  

Posted by whiskrs 7 years ago

Portable cd player laser extraction?

Anyone know how to get the laser out of a portable CD player? A have access to an abundant supply f them, I figured I'd be able to make something cool if i was able to obtain the lasers...

Posted by KentsOkay 10 years ago

Knex Spartan Laser

Here is a Knex Spartan Laser I made, it shoots rubber bands. If you would like me to post instructions please say so.

Posted by bakenbitz 10 years ago

Laser engraving slate

Hi all Thinking about putting a project together based on some of the great instructables on here. Can anyone shed any light on how much power I will need for a laser that will engrave slate? I am not sure whether a diode laser will be up to the job or whether it will have to b a co2 laser. Any info would be appreciated.

Posted by gary101 2 years ago

DIY Laser pointer

Hello everybody, I'm sorry if this is already explained in an instructable, but I can't seem to find one... My question is, is there a way to make a laser pointer from the laser thingy inside an old cd-writer or an old hard drive (that both still work) ? Thanks

Posted by Ramvan 9 years ago

Laser cutter

My dad has an old plotter that I plan on converting into a laser cutter, and I was wondering how powerful the laser needs to be in order to cut thin metal (its ok if it can do it in multiple passes). Where could I get a cheap one? Thanks LinuxH4x0r

Posted by LinuxH4x0r 10 years ago

laser help

How do you take apart a conventional laserpointer like the ones that you get at pet stores?

Posted by kris142 10 years ago

LED Laser Fingers

I just found out about these: LED Laser FingersThey seem to be the perfect thing for those light sculptures...SO....Can anyone make an ible on making these?

Posted by Keith-Kid 10 years ago

what the type of laser can i use

Hi what the type of laser can i use 300 mw laser , 500mw laser or  1000mw ........ like this in ebay;=item3398a7331c or this;=item3cf0cb6fd2 i want to make my diy laser engraver i want to know if the laser removes the powder coated paint from the surface of the Zippo Lighter to reveal the bare brass metal underneath. like this video on youtube

Posted by NURKABIL 3 years ago

Laser alarm circuit

I am searching for a circuit which can drive a siren circuit like this and can be activated by a laser pointer.I have tried a lot of these circuits but all had the same problem:The siren sounds only for a few seconds(As long as the interruption of the laser beam...) Thank you in advance!

Posted by pizza1993 7 years ago

N2 TEA Laser Challenge!

CHALLENGE: To build a functional N2 TEA laser with readily available parts. There are plenty of websites where people describe the laser that they built, but I have never seen anyone on instructables who has done this. Please, just make something! Good luck!

Posted by Xellers 9 years ago