Our little solid-state buzzer is a diminutive 9/16" x 3/32" x 1-1/4" but it buzzes along at 8,000 hertz. Rated for 6VDC 20mA, but works fine with as little as 3V. Mounting brackets with holes on the back of the short sides, 4" wire leads. Lotta buzz for the buck.
Pick a piezo. The phone ringer was, unsurprisingly, originally part of a phone ringer, a mounted piezo transducer rated for a nominal 75dB output at 1 KHz. Measures 1-3/4" dia x 9/16" with mounting wings with 1/8" bores. You'll need an external signal to drive. Kyocera part # KBT-44SB-1A. Or the buzzer from Mallory Sonalert (whose company newsletter is The Buzz, by the way) which draws 3-12mA at 6-16VDC with an output of 68-78dB. Emits a pulsed beep at approx 2900 Hz. (Apply pos DC to pin 1; ground pin 3; ignore pin 2.) Measures 1-21/32" dia x 19/32" with a 7/8" piezo element and leads out of the bottom.
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