Acoustic levitation has the potential to enable novel studies due to its ability to hold a wide variety of\nsubstances against gravity under container-less conditions. It has found application in spectroscopy,\nchemistry, and the study of organisms in microgravity. Current levitators are constructed using\nLangevin horns that need to be manufactured to high tolerance with carefully matched resonant\nfrequencies. This resonance condition is hard to maintain as their temperature changes due to transduction\nheating. In addition, Langevin horns are required to operate at high voltages (>100 V) which\nmay cause problems in challenging experimental environments. Here, we design, build, and evaluate\na single-axis levitator based on multiple, low-voltage (ca. 20 V), well-matched, and commercially\navailable ultrasonic transducers. The levitator operates at 40 kHz in air and can trap objects above 2.2\ng/cm3 density and 4mmin diameter whilst consuming 10Wof input power. Levitation ofwater, fusedsilica\nspheres, small insects, and electronic components is demonstrated. The device is constructed\nfrom low-cost off-the-shelf components and is easily assembled using 3D printed sections. Complete\ninstructions and a part list are provided on how to assemble the levitator.
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