Laser or IR beam alarm system - Page 3 - Electronic Circuits Projects Diagrams Free

shrey · 20th June 2006, 03:40 PM

hi the design is nice & simple to understand.
well, the circuits starts alarming when it is not getting the signal from LED or other transmittter right? Plz guide me to increase the sound level and it should sound permanently untill the user stops it.

raybo · 23rd June 2006, 05:41 PM

dextel I don't think you mean what you say 220 watts input and the output is 220 watts man give me that circuit you just discovered the perpetual moving machine. actualy the original design is bad the 9 volts will last for one shot. Beside i would never biult anything like not when i can buy it for $20

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.

ira thakur · 26th June 2006, 05:48 AM

any thing else in this project

manz · 26th June 2006, 07:25 PM

hm realy interesting project. Is that means I can use any NPN (2N2222,2N3904,2N3053,etc) and for the PNP (2N2955) can u suggest me on what NPN and PNP transitor to use. thanks

ira thakur · 27th June 2006, 06:41 AM

Quote:

Originally Posted by manz

hm realy interesting project. Is that means I can use any NPN (2N2222,2N3904,2N3053,etc) and for the PNP (2N2955) can u suggest me on what NPN and PNP transitor to use. thanks

hi
sorry but i also dont know which transistors r used.. i also want to know if u come to know then plz tell me..

ira thakur · 27th June 2006, 06:46 AM

Quote:

Originally Posted by shrey

hi the design is nice & simple to understand.
well, the circuits starts alarming when it is not getting the signal from LED or other transmittter right? Plz guide me to increase the sound level and it should sound permanently untill the user stops it.

hi
i want to know which transistors r used in this ....means(2N2222 etc)

manz · 28th June 2006, 06:59 AM

Quote:

Originally Posted by ira thakur

hi
sorry but i also dont know which transistors r used.. i also want to know if u come to know then plz tell me..

i just tried the circuit and its working just fine. the transistor i`m using :

NPN = 2N3904
PNP = 2N2955

but the 2N2955 is i litle bit costly (here in my place), maybe you can replace it with other PNP`s.

ira thakur · 28th June 2006, 10:20 AM

Quote:

Originally Posted by manz

i just tried the circuit and its working just fine. the transistor i`m using :

NPN = 2N3904
PNP = 2N2955

but the 2N2955 is i litle bit costly (here in my place), maybe you can replace it with other PNP`s.

thanks a lot..

guryog · 1st July 2006, 06:31 AM

i am designning a circiut for the ir project but i want to know what the distance can be between the sensor and transmitter for optimal working and how i can connect it

manz · 1st July 2006, 05:52 PM

how long (time duration) the normal laser pointer can be turned on without damaging it?
can it last for continuosly a couple of hours? maybe 5-6 hours?

dknguyen · 1st July 2006, 07:54 PM

They are solid state devices so I assume you can keep them on as long as you want as long as it is cooled properly with heatsinks or some other method.

raybo · 2nd July 2006, 03:25 PM

yah dig a hole

Meesam · 3rd July 2006, 12:25 PM

Hi. I am meesam. I have seen the circuit for the IR project. I really like it. But please somebody tell me the real IR detector and its number and name which i can purchase for my project. I also want to make an IR detection system.

nachoz · 11th July 2006, 07:39 AM

hey dere,
im building a similar project as da 1 mentiond abve: my project wud consist of a laser beam pointed at an ldr. it will detect the presence of a car in the carport and transmit a signal to inform me of the cars arrival.
since i am a noob in electronics, i wud jus like sum advice on hw to go about constructing this circuit or ne othr factors
Thanks
nash

tyeo000 · 20th July 2006, 11:51 PM

ok.. first off...
im cheap, i dont go out and buy a crap-load of 555 timers to do this
thats why i go to here
no ics just plain fun!
oh yea
keep up da gewd werk!

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20th June 2006, 03:40 PM
shrey New Member	hi the design is nice & simple to understand. well, the circuits starts alarming when it is not getting the signal from LED or other transmittter right? Plz guide me to increase the sound level and it should sound permanently untill the user stops it.

26th June 2006, 05:48 AM
ira thakur New Member	any thing else in this project

26th June 2006, 07:25 PM
manz Experienced Member	hm realy interesting project. Is that means I can use any NPN (2N2222,2N3904,2N3053,etc) and for the PNP (2N2955) can u suggest me on what NPN and PNP transitor to use. thanks __________________ -manz-

1st July 2006, 06:31 AM
guryog New Member	Help In Ir Design i am designning a circiut for the ir project but i want to know what the distance can be between the sensor and transmitter for optimal working and how i can connect it

1st July 2006, 05:52 PM
manz Experienced Member	how long (time duration) the normal laser pointer can be turned on without damaging it? can it last for continuosly a couple of hours? maybe 5-6 hours? __________________ -manz-

1st July 2006, 07:54 PM
dknguyen Experienced Member	They are solid state devices so I assume you can keep them on as long as you want as long as it is cooled properly with heatsinks or some other method.

3rd July 2006, 12:25 PM
Meesam New Member	Laser or IR beam alarm system Hi. I am meesam. I have seen the circuit for the IR project. I really like it. But please somebody tell me the real IR detector and its number and name which i can purchase for my project. I also want to make an IR detection system.

11th July 2006, 07:39 AM
nachoz New Member	hey dere, im building a similar project as da 1 mentiond abve: my project wud consist of a laser beam pointed at an ldr. it will detect the presence of a car in the carport and transmit a signal to inform me of the cars arrival. since i am a noob in electronics, i wud jus like sum advice on hw to go about constructing this circuit or ne othr factors Thanks nash

20th July 2006, 11:51 PM
tyeo000 New Member	ok.. first off... im cheap, i dont go out and buy a crap-load of 555 timers to do this thats why i go to here no ics just plain fun! oh yea keep up da gewd werk!