I want to put a small "beeper" on a AVR dev board that I made. I have seen some piezo devices that beep when they are simply connected to a DC supply, so I am looking for something like that.
However, a small piezo device (which looked very similar to what I wanted) that I bought from a local store does not beep or do anything when connected to 5V off the board. I had asked for a 5V piezo buzzer and the store guy handed me this thing and told me that it takes 3V to 12V.
I read some articles/posts about the differences between a "buzzer" and a speaker, etc, and some posts mentioned piezo devices that need to be pulsed instead of being given a simple dc supply.
This little device that I bought just has +ve and -ve markings on it; nothing about any resonant freq in KHz or anything.
So I am not sure what I actually bought, and it'll be a while before I can go to that store again. I also suspect that I just might've blown the poor thing by connecting it with wrong polarity.
Any ideas/thoughts...? Any homework that I should do...?