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== Purchasing Commercially Available Device ==== Construction of an Ultrasonic Dog Barking Deterrent ==As a project this device will be constructed and tested with the results documented here. Based on existing research the following lays out plans for the device.* acquisition of the correct high frequency piezoelectric tweeter - This is important as many piezo tweeters are incapable of efficiently producing intense ultrasonic sound. * construction of an efficient audio driver for the piezoelectric tweeter - this includes the audio oscillator stage and the audio amplification stage. * audio directing barrel - Simple PVC pipe of the correct diameter and length to help direct the already highly directional ultrasonic audio. You want to focus on the culprit canine and reduce splatter that might negatively impact other animals