Instructables

laser project problem?

 Hello,
http://www.instructables.com/id/Laser-Surveillance-System-for-under-$20/
I've tried to do this project but i can't complete it .. I can hear the bangs only .. why ??

hakemsaeed (author) 5 years ago
Thanks for reply

I use phototransistor it has 3pins

and I use green laser

how to make it more sensitive ?
Hi Hakeem,

It seems to me that the OPTICS of this project are more important than the electronics. I'd find a little telescope to receive the return with, or make one with some very cheap spectacle lenses.

What about the amplifier for the raw signal ? What are you using there ? 

Steve
hakemsaeed (author)  steveastrouk5 years ago
Ok what i need to make the telescope ?

 for receiving the signal I use a mic port on a  pc .. 
www.howstuffworks.com/question568.htm

Try it. You may still need an extra amplifier before the mic input,.

Steve
Not enough sensitivity. What kind of equipment are you using ? 

Steve