hello LMR, can i ask a little question? what is the simplest circuit of a piezoelectric to produce a buzzing sounds?
keep in mind there are 2 kinds of piezo buzzers.
one type has a built in oscillator so you only have to apply current for it to work.that is the one ignoblegnome is thinking of.though i suspect that one will only be able to beep at one specific tone (anyone?)
the other type is simply the piezo element with no added circuitry, and you have to provide the oscillation for it to actually make a sound.this allows you to chose any frequency within the range the piezo is capable of.
as stated above a 555 timer is a simple and popular IC used to make oscillator circuits.in fact it is so popular that people have made programs and website scripts that calculate the value of resistors and capsfor you to help you achieve oscillations at the specific frequency you want.
check this out: http://www.google.nl/#sclient=psy&hl=nl&source=hp&q=555+timer+calculator&pbx=1&oq=555+timer+calculator&aq=f&aqi=g2&aql=1&gs_sm=e&gs_upl=1893l4926l0l5320l20l16l0l8l8l0l210l1451l1.9.1l11l0&bav=on.2,or.r_gc.r_pw.&fp=8fca43caefa7aa04&biw=1600&bih=741
A simple piezo buzzer will issue a (usually loud) buzz when it is powered. So the simplest circuit is a piezo and a battery.
A piezo speaker element is more like a regular speaker. If you want a variety of tones or even music through your piezo, use one of these, not a buzzer.
If you need a variety of tones, a 555 chip in an astable mode will work well.
The NE555 timer used to be the prefered chip for this kind of task. You can search on google for 555+piezo and get alot of good hits but nowdays i would say that a picaxe would be more easy.
i'm not gonna use any PICAX or any controllers, just a very simple and cheap way to make one!
why didn't you just do an image search for piezo buzzer circuit?
manual 3 for the PICAXE chips. Even if you aren't planning on using a PICAXE chip.