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“This instructable will explain step-by-step how to build a device that detects which note is played on an acoustic guitar. The device accomplishes this task by using a microphone to read in the sound wave, audio amplifier and DC offset circuits to adjust the signal, an algorithm to determine the frequency, and a seven segment display and LEDs to display the note. This instructable was developed while referencing the following Instructables: Arduino Audio Input, Arduino Frequency Detection, and Arduino Guitar Tuner.”

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