if someone has any info or circuit about GAS LEAK DETECTOR BASED ON ULTRASONIC SENSOR(crystal , ceramic )
i would be pleased !

 

Hello,

I found your post in this thread:
http://forum.allaboutcircuits.com/showthread.php?t=12878
We call this hijacking over here.

Now you have a thread of your own.

Bertus

 

http://www.google.com/imgres?imgurl...78ga9htWpCw&page=1&ndsp=72&ved=1t:429,r:4,s:0

Only one I could find.

 

What kind of gas do you want to detect?
Gasoline? Natural gas? Propane? Butane? Nitrogen? Helium? Oxygen? Etc?

Maybe with a circuit with a piezo microphone that hears a HISSSS?