Old 04-04-2008, 03:41 AM #1
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Default Unregulated Lasers

Hi all,

I just joined this forum and I can't seem to search for my query using the search function. I hope my query has never come up before coz I know how irritating it is to keep seeing the same question popping up again & again.

Anyways, what I wanted to ask is: do commercial red lasers that use 3xLR44 have voltage regulators or drivers or anything? Or do they just use a laser module like the one from DX (SKU: 5900; sorry I don't have permission to post links yet) and connect the red & black wires to the batteries?


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Old 04-04-2008, 04:14 AM #2
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Default Re: Unregulated Lasers

If you're talking about the cheapo 1-5mW reds, all I saw on the driverboards they have is a resistor or two....I don't think they have any regulation.The sku 5900 is probably the same.
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Old 04-04-2008, 04:15 AM #3
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Default Re: Unregulated Lasers

the junky red pointers available everywhere just use a small resistor to regulate the current somewhat, that's about it
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Old 04-04-2008, 05:46 AM #4
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Default Re: Unregulated Lasers

Wow! Quick replies!

So are those laser pointers ok to use then? Will the diode burn out fast? I would like to salvage those cheapo laser pointers to get the modules out for another project. Haha!

One more thing about the SKU 5900. It says 9mm. Is that the length of the entire module?
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Old 04-04-2008, 05:50 AM #5
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Default Re: Unregulated Lasers

You can use the modules for another diode but you'll gonna need a new driver for it.A driver for 5mW isn't gonna do a good job on a highpowered one : 9mm is the thickness of the module.
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Old 04-04-2008, 08:08 AM #6
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Default Re: Unregulated Lasers

Huh? You mean the module is not the one that produces the laser?

What if I don't need a high powered one? I just need it to produce a dot for presentations. Haha! Seems like people here are very into modifying and burning things with their lasers... which is cool, but not suited for my project.

Now, can anyone tell me where to get the smallest module? Actually, I need a short one. 2cm ones from DX might do the trick, but just wondering if there're shorter ones.
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Old 04-04-2008, 08:34 AM #7
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Default Re: Unregulated Lasers

The laser diode, LD, produces the dot and the module comes with a 5mW LD with a suitable driver (I think a few resistors) and a focusable housing.

If you want a complete laser pointer then DX sell some that will do the trick really cheap

FAQ: http://www.laserpointerforums.com/fo...num=1206843997
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Old 04-04-2008, 08:44 AM #8
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Default Re: Unregulated Lasers

So the module on DX, SKU 5900, has a Laser Diode, a driver, and focussing all inbuilt right? If I get that, all I need to do is connect batteries to it. Yes?

I want laser pointers, yes, but not in the keychain rod forms they have on DX, nor the pen style ones... nor the huge ass kind used in labs. Haha! I dunno what's the smallest I can get but I want it real small. I'm still looking though. =)
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Old 04-04-2008, 09:43 PM #9
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Default Re: Unregulated Lasers

yeh just hook it up to batteries. that's about as small as they come
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Old 04-04-2008, 11:59 PM #10
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Default Re: Unregulated Lasers

I'm not sure what style laser you are after. Maybe if you looked on DX for torches with the right shape you could use it as a host

this seams doable for example: http://www.dealextreme.com/details.dx/sku.8988

or maybe you could do something with this: http://www.dealextreme.com/details.dx/sku.10806
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Old 04-05-2008, 03:04 AM #11
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Default Re: Unregulated Lasers

Alright! Thanks Ifrgtmyname... =) That's more or less all I needed to know. I'm not looking to fit it somewhere so I can up the output. Haha! But thanks anyways. Maybe when I'm done with my project, I could post up what I did... haha!
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Old 04-05-2008, 11:09 AM #12
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Default Re: Unregulated Lasers

good idea! keep us updated
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