How to wire up a piezo? (Warning, I'm stupid)

Hiya,

Hopefully this is the right place to ask. But I have a problem with birds
and have been told that a ultrasonic sounder operating at the right
frequency should deter them and be inaudiable to humans. I've been told
it's simple to built, all I need is a 100w piezo and a +-300w squarewave
driver and run it at >20khz Now, this all sounds a bit greek to me, but
could someone here shed some light on what I need (In english) and even
better - Places to buy it in the UK and then build it. I know I'm asking a
lot, but I can't pay out over £400 to buy a fancy indistrial one...

Cheers.
Dan

 

Ultrasound noise doesn't bother birds. It'll drive every dog in the
neighborhood crazy though.