If you are facing a staff and want to make a machine to play this score (just like we sing and play an instrument), what should we do? No matter whether it is WAV or MP3 files, you can't help you. We can find the answer from the more ancient equipment - the music box.
The music box uses the bumps on the copper to determine which kind of tone the reed vibrates, and our production is the same. The score is used to determine the frequency that the 555 oscillator circuit should produce, thus giving a note. This design is not complicated, we can also quickly make a "electronic music box" of its own.
In this design, the one we used to control the note selection is a punched piece of paper, and the one on the piece of paper used to read the note is the copper wire finished contact and the underlying copper piece. The 13 contacts correspond to 13 resistance network respectively. When different contacts are in contact, the resistance of the entire resistor network changes.
What is the use of the resistance network resistance after the change? It determines the oscillation frequency of the 555 oscillator circuit. If we can determine the resistance of the 555 oscillator circuit at each tone, then we can determine the resistance of the resistor network under each contact. When the two contacts are in contact with each other, the oscillator can make a corresponding sound!
In this design, the "spectrum" of the music is similar to the "score" of the music box, a piece of paper tape is connected end to end, and the holes in the tape pass through the identification contacts in turn. This allows us to make the oscillator record the notes recorded on the tape in sequence while pulling the tape at a constant speed. A song was played like this.
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