Place the washer on the bottle and line up the empty bottle on top of the water-filled one. Fill one bottle with about two-thirds water. This easy little experiment doesn't take much: just two empty and clear 2-liter bottles, a metal washer, water and duct tape. Used with permission from Storey Publishing. The amplifier directs them from your phone’s speakers into the cardboard cups, where, instead of scattering, they are gathered and channeled in one direction-out the openings.Įxcerpted from Cardboard Box Engineering © 2020 by Jonathan Adolph. Once sound waves are created, they want to spread out in all directions. The Cup Amplifier focuses and projects sound waves, in the same way that a cheerleader’s megaphone (or even just your cupped hands) amplifies your voice. Tabs cut all around the hold make it easy to glue the cardboard tube in place.Ĭut a slot with a flap to support your phone. For engineers, that’s a design worth copying.Ĭustomize your amplifier to fit any size phone! Animal ears use the same science, but in reverse: they help creatures hear by gathering sound waves and directing them into the ear. If the two cups look a bit like the attentive ears of a cat or fox, that’s no coincidence. The audio is deeper, richer, and louder, thanks to the science of sound waves and the natural amplification created by the cone-shaped cups. Slide a mobile phone into this low-tech amplifier and the result will be music to your ears.
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