I am designing a fairly simple board where I need to sound a simple chirp/beep every couple of minutes, however, layout space is extremely limited.
Therefore, a full-blown piezo buzzer is a no-go; they mostly seem to be of at least 10 mm diameter based on my research.
I am interested in a type of part or circuit within less than 6 mm X 6 mm X 3 mm of board space, which can produce a chirp/beep (of around 10 to 20 dB, i.e., audible from about 5 feet away). Is this achievable?
For instance, I recall encountering a high-pitched noise in the past from an inductor within a buck-boost regulator circuit -- the sound wasn't loud enough but I am also curious to see if there are methods to reproduce something similar but with greater amplitude.