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.

Call it the Heart of a Doll, because that’s what it was, once upon a toy store. Today it’s a red, heart-shaped plastic thingy, 2-1/2" wide x 7/8" thick, with a smaller heart-shaped button on top. And yeah, it’s a little creepy. Hold the button and it emits a soothing electronic heartbeat at a tad under 60bpm. Runs on (2) button cell batteries, included.

This PCB-mount piezo buzzer draws 1mA at 3VDC and measures 7/8" dia x 1/4" thick with (2) radial leads. Driver not included. Made in Japan by Projects Unlimited®. Model AT-20.

“Hey baby, we’ll be back to pick you up later!” Imagine yourself reliving that classic TV moment with this raw PC board for a digital audio recorder. There’s nothing to build except a housing. Comes with push-button switches for record and playback on 2” leads, and a 9mm microphone on 2” leads. Plus a 1-1/2” speaker. Max recording time is approx (13) seconds as it is, and (3) button cell batteries are included.