"Shaun" wrote in message
...
Hello,

I wanted to resurrect an old project from Popular Electronics magazine May
1991. I thought some people on this list might want to build it.

Its a very very loud alarm, to get someone's attention, but the
frequencies
that it operates at don't match the description in the magazine article,
they're higher. The alarm is still very annoying though. Some of the
parts
are not available such as the matsu****a transducer ( piezo) if anyone
knows
were to get them please post. I use a piezo tweeter which is much larger
but works very well.

It's a three page article so here we go.

Shaun


oops, the pages didn't go threw in the right order.

also note that Niche Technologies cannot be found, so you can't order parts
from them.

Shaun