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Old 05-26-2008, 01:19 AM #1
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Default Help with laser

I have this pen that has a red laser in it. I removed the pen and the metal casing around and I have a laser diode and it attached to a chip. At the other end of the chip it has a spring to put the positive side of the batteries too. Here is a picture (not allowed to post links so replace strings in brackets respectively):

img204 [dot] imageshack [dot] us/img204/3567/lasercg4 [dot] jpg

Can someone explain why there are two wires (blue lines) that are just hanging off not touching the diode? Also, how can I get this thing to light up right? I have a 3 volt button battery, 4 other small ones, and two medium sized ones taped together lined up. When I put the positive side to the spring and press the button it doesn't light up. I am very new to this so please be nice

PS: The red square is the button.


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Old 05-26-2008, 02:18 AM #2
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Default Re: Help with laser

Without even looking at the picture, I can tell you that you will not be able to provide the correct amount of current (and maybe even voltage !) to a high powered diode if you are trying to use the driver board that came with a 5mw or lower type of pointer - those drivers are made to drive UP TO 5mw, and you would be lucky to get that much out of it, sorry to be the bearer of bad news...
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Old 05-26-2008, 03:39 AM #3
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Default Re: Help with laser

What exactly are you trying to do? Place the laser in another type of enclosure? :-?
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Old 05-26-2008, 10:52 AM #4
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Default Re: Help with laser

Let me clarify myself. This laser diode and chip came out of a pen together in one piece. The only problem is that I can't figure how to power it. I don't know what to do. I don't know where to put the negative side of the battery to. The positive goes onto the spring and the negative... I don't know.

The laser inside the pen used three LR44 button cell batteries. I don't know anything about batteries. I put the batteries on the spring, closed the pen, and voila, it worked. I then removed the pen because I wanted to make my own enclosure (answering your question) and I just held the batteries' positive side to the spring, and it didn't light up. The chip is only connected to the diode by one wire, and there are two others hanging off. Did they break of in the process of me removing it from the pen? I could get them back on, I have a soldering iron. Here is a real picture of the diode and chip:

img246 [dot] imageshack [dot] us/img246/685/1022419gp6 [dot] jpg
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Old 05-26-2008, 03:52 PM #5
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Default Re: Help with laser

Okay - you need to put the negative from the battery to the casing of the diode. Most red diodes are case negative, so you do not need to solder directly to the diode, but merely the case itself. Sorry I misunderstood your intent !
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Old 05-26-2008, 06:53 PM #6
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Default Re: Help with laser

SenKat almost has 5000 posts!
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Old 05-26-2008, 06:55 PM #7
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Default Re: Help with laser

Quote:
Originally Posted by cbrian4
SenKat almost has 5000 posts!
I think perhaps I talk too much :P Erm...I mean, type...DOH ! There I go again I'ma class 47 laser now ! LOL
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Old 05-26-2008, 06:59 PM #8
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Default Re: Help with laser

Quote:
Originally Posted by SenKat_Stonetek
[quote author=cbrian4 link=1211764761/0#5 date=1211828002]SenKat almost has 5000 posts!
I think perhaps I talk too much :P Erm...I mean, type...DOH ! There I go again I'ma class 47 laser now ! LOL[/quote]

lol congrats!
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Old 05-26-2008, 10:09 PM #9
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Default Re: Help with laser

Quote:
Originally Posted by SenKat_Stonetek
Okay - you need to put the negative from the battery to the casing of the diode. Most red diodes are case negative, so you do not need to solder directly to the diode, but merely the case itself. Sorry I misunderstood your intent !
For some reason my mind is telling me low powered red laser diodes are case positive, I'm not sure about that though!

So if I'm right, this diagram is right. If SenKat is right, then flip the polarity on that picture.
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Old 05-27-2008, 01:52 AM #10
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Default Re: Help with laser

Won't work at all either way. Could the diode or chip been damaged when I removed it? Is it normal for two wires to be hanging off the sides like that?

Also, just to mention, I can't even get a light bulb to light up with a D battery.
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Old 06-06-2008, 01:59 PM #11
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Default Re: Help with laser

Quote:
Originally Posted by amrclutch1
Won't work at all either way. Could the diode or chip been damaged when I removed it? Is it normal for two wires to be hanging off the sides like that?

Also, just to mention, I can't even get a light bulb to light up with a D battery.
yes it can be damaged, and its not normal for there to be hanging wires. (stating the obvious)

you should try starting over with some proper laser items, your probably broke that one when taking it apart or when trying to get it to work.
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