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This piezo sounder is an inexpensive way to add sound to your project. The wide operating voltage of 1 – 30 V and low current draw (5 mA at 9 V) make it easy to control this buzzer directly from a microcontroller I/O line.
buzzer with built-in oscillator
This large (30mm diameter) piezo element is nicely enclosed with mounting holes so you can attach easily.