Beginner Laser or IR beam alarm system - Page 5 - Electronic Circuits Projects Diagrams Free

sockeye101 · 17th February 2007, 07:45 PM

Would it be possible to place one of these 110db personal alarms instead of the buzzer by connecting the two wires that would normally go to and from the buzzer and connecting them to the battery terminals on the personal alarm, or would i have to modify the circut in any way (different resistor

, different placement, etc.)

lurkingdevil · 10th March 2007, 05:09 AM

Quote:

Originally Posted by Dexel

Pretty nice design. I made one myself but it only has three components. A resistor, transistor, and a photo transistor. I wired it so that I have an input of 220watts and an output of 220watts(so I can use either a radio or a lighting fixture or any appliance running in 220watts) I've been having loads of fun with it but there's just one problem. It turns off as soon as you leave the beam so I want to install a time switch and have it run for a few more seconds after its turned on. Can you help me? I don't know what to add to give it that effect.

can u give me the circuit diagram.i would like to build up one of those.
this my email-id -lurkingdevil@gmail.com .Also please tell me how to keep it on for some time if u fugured it out.thx

sockeye101 · 23rd May 2007, 11:56 AM

Quote:

Originally Posted by Roboticinfo

Try this website

http://www.commlinx.com.au/schematics.htm

the website wont work. is it cause im using firefox or what?

sockeye101 · 23rd May 2007, 12:02 PM

Quote:

Originally Posted by lurkingdevil

can u give me the circuit diagram.i would like to build up one of those.
this my email-id -lurkingdevil@gmail.com .Also please tell me how to keep it on for some time if u fugured it out.thx

can i have that circut to? heres my email
dak0ta1@hotmail.com

sockeye101 · 23rd May 2007, 12:06 PM

there is another way to build a circut, just have a battery connected to a photocell holding up a nail with an electromagnet, than, if the laser stops, the nail drops and completes another circut that triggers an alarm

things · 25th May 2007, 06:15 AM

why are you asking for the circuit?. it's on the first page of this thread!!

sockeye101 · 28th May 2007, 01:41 PM

what is the part of the circuit that controls how long it stays on? i am hoping to make this circuit with only a capacitor, a transistor, a photocell, and a resistor, but i need to know how to make it stay on for 10 seconds. i dont need the circuit, im just wondering if this will work.

sockeye101 · 28th May 2007, 01:47 PM

Quote:

Originally Posted by Dexel

Pretty nice design. I made one myself but it only has three components. A resistor, transistor, and a photo transistor. I wired it so that I have an input of 220watts and an output of 220watts(so I can use either a radio or a lighting fixture or any appliance running in 220watts) I've been having loads of fun with it but there's just one problem. It turns off as soon as you leave the beam so I want to install a time switch and have it run for a few more seconds after its turned on. Can you help me? I don't know what to add to give it that effect.

can i have the circuit to? heres my email- dak0ta1@hotmail.com

andu316 · 13th November 2007, 06:42 AM

i want to make project on these for about 20 pages so please help me to make these

mneary · 14th November 2007, 12:39 AM

Please be more specific. Are you looking for help with homework?

NiniPoojaSheeja · 14th March 2008, 01:55 PM

Hey...this is a gud circuit ... Actually it would be nice if I get the theory, construction and the design of this circuit. Pls get me with the same.

**Krumlink** · 14th March 2008, 11:12 PM

it sounds like you want this for school. Not suprised.

Conrad_Turbo · 18th March 2008, 06:17 PM

Quote:

Originally Posted by NiniPoojaSheeja

Hey...this is a gud circuit ... Actually it would be nice if I get the theory, construction and the design of this circuit. Pls get me with the same.

All I saw was this.

aki21 · 3rd April 2008, 03:59 PM

Hi, does anyone had a schematic for IR sensor? i want to hook it to my game controller so i need IR so that it would be invisible when i struck it. tnx~

henhen0412 · 15th April 2008, 03:21 AM

hay i am trying to make your gadget but i need the codes for the 4 transistors on this design could you tell me the codes

17th February 2007, 07:45 PM	(permalink)
sockeye101 New Member	pesonal alarm Would it be possible to place one of these 110db personal alarms instead of the buzzer by connecting the two wires that would normally go to and from the buzzer and connecting them to the battery terminals on the personal alarm, or would i have to modify the circut in any way (different resistor , different placement, etc.)

25th May 2007, 06:15 AM	(permalink)
things Experienced Member	why are you asking for the circuit?. it's on the first page of this thread!! __________________ The 3 laws of science.... 1. If it smells bad, It's chemistry. 2. If it's mushy, It's biology. 3. If it doesn't work, It's physics. www.laserpointerforums.com A forum for disscusion of lasers and laser shows! www.laserchat.org IRC chat for laser and electronic related stuff.

14th March 2008, 01:55 PM	(permalink)
NiniPoojaSheeja New Member	Plz Get ThE OpErATioN aND cOnstructiOn Of ThIS cIRCuit. Hey...this is a gud circuit ... Actually it would be nice if I get the theory, construction and the design of this circuit. Pls get me with the same.

14th March 2008, 11:12 PM	(permalink)
Krumlink Moderator Blog Entries: 1	it sounds like you want this for school. Not suprised. __________________ Visit my website! http://www.freewebs.com/electronic-hobbyist

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23rd May 2007, 12:06 PM	(permalink)
sockeye101 New Member	there is another way to build a circut, just have a battery connected to a photocell holding up a nail with an electromagnet, than, if the laser stops, the nail drops and completes another circut that triggers an alarm

28th May 2007, 01:41 PM	(permalink)
sockeye101 New Member	what is the part of the circuit that controls how long it stays on? i am hoping to make this circuit with only a capacitor, a transistor, a photocell, and a resistor, but i need to know how to make it stay on for 10 seconds. i dont need the circuit, im just wondering if this will work.

13th November 2007, 06:42 AM	(permalink)
andu316 New Member	i want to make project on these for about 20 pages so please help me to make these

14th November 2007, 12:39 AM	(permalink)
mneary Experienced Member	Please be more specific. Are you looking for help with homework?

3rd April 2008, 03:59 PM	(permalink)
aki21 New Member	Hi, does anyone had a schematic for IR sensor? i want to hook it to my game controller so i need IR so that it would be invisible when i struck it. tnx~

15th April 2008, 03:21 AM	(permalink)
henhen0412 New Member	hay i am trying to make your gadget but i need the codes for the 4 transistors on this design could you tell me the codes

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