Gikfun 5V 2 Terminals Passive Electronic Buzzer for Arduino (Pack of 10pcs) EK2146

These are the simplest way of generating tones with an Arduino (or a 555 timer or other digital signal source.) You simply hook one lead to a signal pin and ground the other lead. Then on the Arduino, use the tone command to send a specific frequency to the signal pin you chose. The tone command also lets you specify the duration of the tone. It works great as a method to "beep" when a task is complete, but this isn't an audio speaker. It's a piezo device which is playing square waves sent via digital pins. Trying to play music through one of these would sound horrible. One note about the loudness. I had this on a breadboard last night and it was alternating between 1kHz and 2kHz tones. Since it was late, I tried putting my finger over the hole on top to "muffle" the sound a bit. This has always worked on larger piezo emitters I've used in the past. On this particular device covering the little hole actually made it significantly louder. Huh!?! Other than that little oddity, these little emitters are a true bargain. They work quite well and are dirt cheap. They're also nice and compact, taking up minimal space on a breadboard or circuit board. Highly recommended.

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Used these and Arduino Nano's to make music for our student project. Bought about 80 of them. No DOAs! Loud enough to be annoying.

It took some reading on the internet to figure out how to make a good audible tone. I used a PNP transistor to amplify the sound. They work perfectly when you use the tone() function in Arduino. I used a 500 ohm resistor between the digital signal and the base of the transistor. My external supply is 8.5V. I think the internal resistance of these buzzers is 42 ohm. I am going to add a 10 ohm resistor to limit the current a bit.

reliable product