Comments on: How to create your own laser home alarm system for under $20 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/ tech, science, news and social issues for geeks Wed, 10 Mar 2010 20:28:11 +0000 http://wordpress.org/?v=abc hourly 1 By: bhagya http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-221433 bhagya Sat, 16 Jan 2010 14:32:11 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-221433 I'm going to make a laser base security system.but the problem is it must work all ina day.so i must find good laser source and photodiode or phototransistor or LDR for that.cost is not mention. i just need good quality parts. laser beam must go 40 feet without reducing its intensity and using sensor i want to get a pulse when laser beam cut.can you help me to find these laser source and sensor. I’m going to make a laser base security system.but the problem is it must work all ina day.so i must find good laser source and photodiode or phototransistor or LDR for that.cost is not mention. i just need good quality parts. laser beam must go 40 feet without reducing its intensity and using sensor i want to get a pulse when laser beam cut.can you help me to find these laser source and sensor.

]]> By: kykay http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-205824 kykay Sun, 22 Nov 2009 10:04:18 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-205824 does it really work does it really work

]]> By: Delray Diva http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-178319 Delray Diva Fri, 07 Aug 2009 21:57:34 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-178319 ROFLMAO............um............I will never be able to make that. Can you just send the site to me of where I can buy that? lol ROFLMAO…………um…………I will never be able to make that. Can you just send the site to me of where I can buy that? lol

]]> By: Della http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-176569 Della Sun, 02 Aug 2009 17:00:58 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-176569 it seem good solution for me. i’ll try it. thanks. it seem good solution for me. i’ll try it. thanks.

]]> By: mayli http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-164340 mayli Sat, 20 Jun 2009 19:48:12 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-164340 Is anybody able to answer my questions which I have posted them on 6/13? I really would appreciate. I'm having troubles to get it working. Is anybody able to answer my questions which I have posted them on 6/13? I really would appreciate. I’m having troubles to get it working.

]]> By: Ty http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-163687 Ty Wed, 17 Jun 2009 22:31:30 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-163687 Where can i buy all this stuff, and can i get it on the internet? Where can i buy all this stuff, and can i get it on the internet?

]]> By: mayli http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-163056 mayli Sat, 13 Jun 2009 16:55:45 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-163056 Yeah, can anyone answer my questions. I have the circuit wired all up but doesn't work. Once I connected it to the 9V battery, the alarm immediate went off. To my understanding, it should go off when the laser light is broken. My questions are listed below? 1. where the base of transistor is wired to? To the positive of 9V battery and 5k variable resistor? 2.There are three leads(legs) on variable resistor, which two are wired to the positive of 9v battery(which is the same point as wired to the base of transistor)? 3. where the collector of transistor is wired to? To the negative of 12V DC Sire and the negative of 1000uF capacitor? 4. What type of photocell is the right kind? Can it be different kind or it has to be exact the same as it is shown in the video? If it is so, where to order one? 5. How about the value of the variable resistor? I have 100K variable resistor that I used, is it a problem? Yeah, can anyone answer my questions. I have the circuit wired all up but doesn’t work. Once I connected it to the 9V battery, the alarm immediate went off. To my understanding, it should go off when the laser light is broken. My questions are listed below?

1. where the base of transistor is wired to? To the positive of 9V battery and 5k variable resistor?
2.There are three leads(legs) on variable resistor, which two are wired to the positive of 9v battery(which is the same point as wired to the base of transistor)?
3. where the collector of transistor is wired to? To the negative of 12V DC Sire and the negative of 1000uF capacitor?
4. What type of photocell is the right kind? Can it be different kind or it has to be exact the same as it is shown in the video? If it is so, where to order one?
5. How about the value of the variable resistor? I have 100K variable resistor that I used, is it a problem?

]]> By: miguel http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-157074 miguel Sat, 16 May 2009 22:11:17 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-157074 I found all of this at radioshack. Any idea what are the catalog numbers i need? Also, I'm not very good at reading the sketch or skematic, any extra help? I found all of this at radioshack. Any idea what are the catalog numbers i need? Also, I’m not very good at reading the sketch or skematic, any extra help?

]]> By: kmi http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-147470 kmi Tue, 07 Apr 2009 12:46:27 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-147470 i need help hooking up the circuit i followed the schematic, but still can't get it to work. Could someone explain why the transistor is needed specifically in this circuit? i need help hooking up the circuit i followed the schematic, but still can’t get it to work. Could someone explain why the transistor is needed specifically in this circuit?

]]> By: Iktedar http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-147290 Iktedar Mon, 06 Apr 2009 19:06:38 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-147290 hu, did u uploaded ur system, if u did plz post the link. hu,
did u uploaded ur system,
if u did plz post the link.

]]> By: anthony http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-141057 anthony Thu, 12 Mar 2009 20:07:32 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-141057 can you use a magnetic contact switch instead of a the laser and if you can please show how can you use a magnetic contact switch instead of a the laser and if you can please show how

]]> By: shafic shreim http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-134461 shafic shreim Wed, 11 Feb 2009 20:01:23 +0000 http://www.geeksaresexy.net/2008/03/03/how-to-create-your-own-laser-home-alarm-system-for-under-20/#comment-134461 it is a very nice little project and i would like to make one like this and from this momment i will try this brilliant idea :D:D it is a very nice little project and i would like to make one like this and from this momment i will try this brilliant idea :D:D

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