The well-known 8038 IC function generator. Dunno how much it costs
these days, if it's still being made.

It also has sawtooth and square wave outputs.

I played with one a lot as a kid, that my Dad had made when I was very
young, from an RS kit (PCB included, etc.). Great fun, and educational,
with a 'scope.

But may I ask why you need a sine wave? Esp. at 15kHz and
driving a piezo tweeter?


Martin
--
M.A.Poyser Tel.: 07967 110890
Manchester, U.K. http://www.livejournal.com/userinfo.bml?user=fleetie