after reading some air zounds stories and some 12v horn stories, i searched for an air horn... And i found this vid.

After a few test horns, i ended up with my first air powered horn. The only problem is, i can't find a small trigger valve... but once i find one, im going to mount this on to my bike.

I used
some old pill bottle
a shrader valve from a tire (blow out)
1.5l Mt. Dew Bottle
a plastic pen (the body)
hot glue
and a female shrader valve from a broken compressor i found at school.
and a piece of black plastic bag plastic...

I'm not sure how high air zounds is pumped up to, but i pumped mine up to 40 psi for a test run.
The clipping noise is after the upload... some compression thing. its a steady toot though. Did not last as long as i wanted, and i need it louder!