Dog-gone-duino

Build an Arduino driven dog deterrent.​
-- Joseph LaBonde "Does anyone have a suggestion for an Arduino driven speaker that can produce 23Khz-40Khz?I am setting up a motion sensor dog deterrent." What you need is NOT a speaker, but a Piezoelectric Transducer! * 40Khz (35 Watt) NB: The "Piezoelectric Effect" is the phenomenon that occurs when a mechanical stress is applied to certain materials, resulting in an electric charge. * Timing crystals (components) utilize this effect: They are "Crystal Oscillators" -- When a crystal (like quartz) is packaged in such a way as to compress the crystal, it will provide a stable "clock signal" for our digital IC projects. * The effect can be REVERSED: If I run an electrical charge through a piezoelectric material, it will create a mechanical stress. * In transducers, this mechanical stress become vibrations that in turn create sound waves.