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Post by Deleted on Mar 2, 2005 12:35:24 GMT -8
Hi i am very much intersted in making A Laser Beam Alarm but before i start i have some doubts to be cleared so please help me .I AM TOTALLY NEWBIE to electronic world......................... 1-Laser pointer how to connect it to adaptor and how many resistor should i atttach of what capacity?mine is 220v current? 2-"Aimed at the Photo-Transistor thats attached to the reciever"what exactly is Photo-Transistor ?Do reciever means the glass which is outside the box? 3-Where and hoe to connect to alaram to sound bell ? 4 A very big thanks and this forum will surely increase knowledge for me regards Regards
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Post by Gary Lecomte on Mar 2, 2005 21:09:18 GMT -8
You would Need a Transformer and diodes to give you a 12 vold DC Supply.
A Photo Transistor is a Special type of Transistor that detects Changes in Light,
As Shown in the Drawing.
I Think this Project is Too Advanced for your knowledge of Electronics. You might want to Study Electronics a bit more before you try making this.
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Post by Deleted on Mar 3, 2005 1:55:00 GMT -8
thanks for the replay .i wrote message Please check PM
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Post by Gary on Mar 5, 2005 15:26:07 GMT -8
alaveny, Wrote: "Please check PM"
I Do Not Understand.
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Post by Deleted on Mar 6, 2005 0:36:47 GMT -8
Hello There sorry for confussion PM is private message .Sorry again By the way can i use dead mouse RF and Phototransistor? Thanks
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Post by Gary Lecomte on Mar 6, 2005 5:52:10 GMT -8
I Can't say for sure as I have no idea What Photo transistor or other parts are in that mouse.
And I'm not sure I got your Private Message. Did you send me an email? If so, Did I reply?
Take care.........Gary
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Post by Deleted on Mar 6, 2005 7:03:14 GMT -8
Hi Yap send you email please check it Thanks for everything
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Post by Jody on Jun 13, 2005 11:19:55 GMT -8
I'm excited about the laser alarm system. I have equipment (trailers-towable) that come up missing I notice the circuit brd layout is gone. I was just getting ready to etch...any idea's ?? TKS... Jody TKO Productions... LA
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Post by Gary Lecomte on Jun 19, 2005 6:34:53 GMT -8
I have Re-Done this Article with an Improved Design. The PCB is Now posted in the article.
If you have More Problems or Questions, EMAIL ME!
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Post by rupert on Jun 20, 2005 21:51:22 GMT -8
Hi Gary, I'm new here but not a newbie to electronics tinkering. I've been thinking about a circuit like you've designed here (thanks for saving me the work!) since I picked up a few laser pointers like the one discussed at the Dollar Store.
I have a couple of questions: 1 - How do you get the laser pen apart? I get the caps off of each end then what? I see a threaded part but it seems glued in and I don't want to ruin the optics. 2 - I've heard that laser LEDs are quite sensitive to over - current, would it be wise to use a regulated supply? Or are these cheapo laser pointers not as fussy? 3 - Does the laser LED get hot if run continuously? Does it need more heat sink than it comes with, to run 24 hours a day? Maybe the supply should be pulse width modulated, or am I just worrying too much about the heat?
Thanks Rupert
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Post by Gary Lecomte on Jun 22, 2005 4:59:40 GMT -8
1 - How do you get the laser pen apart? I get the caps off of each end then what? I see a threaded part but it seems glued in and I don't want to ruin the optics.
Answer: It is Very Difficult for me to Answer this question. There are a Number of Different types of these Laser Pens. But you DON'T Want to do Anything with the Optics End. Just go in from the Battery end.
2 - I've heard that laser LEDs are quite sensitive to over - current, would it be wise to use a regulated supply? Or are these cheapo laser pointers not as fussy?
Answer: That is Why you need to change the Limit Risistor to one that is Appropriate for your Supply Voltage.
3 - Does the laser LED get hot if run continuously? Does it need more heat sink than it comes with, to run 24 hours a day? Maybe the supply should be pulse width modulated, or am I just worrying too much about the heat?
Answer: If it is run at the Proper Current, It won't get too hot. I would NOT Recommend PWM. Just a Resistor is fine.
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