Perfect Pitch Circuit

  
Perfect pitch, which is based on the 8751 microprocessor, is an inexpensive and easy-to-build instrument tuner/frequency counter with a built-in headphone amplifier and a visual metronome. Perfect pitch converts the audio signal from your instrument to a digital signal, and displays the musical note you are playing and its frequency in real time on a 16-character liquid-crystal display.
Perfect Pitch Circuit - schematic

It also has an auxiliary audio input for radio, tape, or CD players so that you can tune up and play along with your favorite artists.




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