Dear Melanie,
You forum has lots of interesting informations. Thanks for keeping upto-date information.
I have a problem. I got a piezo buzzer from a smoke detecting alarm.
I like to use it in my PIC based circuit.
This buzzer has three wires. (red, black & white)
Can you suggest why there are three wires. I guess red for +, and blank for -.
Since this one is sealed I am unable to go thru.

Please help me.

DOminic
Riyadh
Saudi Arabia