I just received my first Arduino and excited about expanding my knowledge of electronics. I was in radio shack earlier today and was looking at a piezo buzzer to mess around with. They had a 12v , 7mA buzzer with an operating ranges of 3-16v. I was wondering if using the Arduino 5v would be enough to get an audible sound or would I have to ramp it up to 12v. I couldn't find specs on the buzzer I figured they would have a dB vs V graph.
At 7mA you can just connect the Piezo to the arduino and run a simple example that comes with the arduino(the Melody sketch) and just test it, and see if it works.