A metronome marks time by producing a regular sequence of "clicks" or "pocks". Adjust the click rate by adjusting R2 or changing C1's value. That will varying the RC time constant so it will also varying the "delay time" of the buzzer or speaker. This project is so simple, applicative and low-cost. It is suitable for you who loves to learn about music and build and use this project for your low-cost metronome. :-)
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