Bob La Londe wrote:

Look up Sylvania 555.

Sylvania? National Semiconductor and Signetiics were the two big
manufacturers. Sylvania had the ECG line, but sold it to Philips long
before Philips sold it to NTE.


Its an oscilating IC.


It's a timer than can be used in a monostable mode or an astable free
running mode.


http://www.national.com/mpf/LM/LM555.html#Overview
http://www.national.com/profile/snip.cgi/openDS=LM555


You can do all kinds of things with a couple of them.
Add a small amplifier and a speaker that can reproduce the sound you are
looking for. You used to be able to buy a cheap amplifier kit at Radio
Shack, but they may no longer be available.


--
You can't fix stupid. You can't even put a band-aid on it, because it's
Teflon coated.