laser project problem?

I've tried to do this project but i can't complete it .. I can hear the bangs only .. why ??

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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 ? 

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 .. 

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

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