I put in an order for some additional buzzers to try out.
Ladies (are there any ladies?) and gentlemen, I crown a new micro buzzer winner.
Weighing in at a featherweight 0.74g and rated at 87dB, meet the Kingstate KXG0905 electromagnetic buzzer:
With a height of 5mm and diameter of 9.6mm, it’s one of the smallest I’ve seen. And this thing is loud.
It plugs in straight to the buzzer pin, no external circuitry necessary.
I’ve only found them online at RS components.