Prototyping and spectral analysis of nylon block and mini wood electric guitar with distortion effect

Gunawan, Julius (2017) Prototyping and spectral analysis of nylon block and mini wood electric guitar with distortion effect. Bachelor thesis, Universitas Pelita Harapan.

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Abstract

In this research, an electric guitar is designed by using nylon block as the body and also a smaller version of wooden guitar which is called a mini wood guitar. Before testing the wooden electric guitar, function generator is used to produce signal as an input voltage for the Behringer distortion and DIY distortion, which is then tested with the oscilloscope for frequencies and spectrum analyses. The electric guitar will then be disassembled to take out the components, and will be used to design the nylon block electric guitar and mini wood guitar. The nylon block body will be re-designed, so the distortion will be installed and fitted into the nylon block body, and it will become a travel guitar which is more convenient because it is more portable. From the signal measurement data of DIY distortion and Behringer distortion, it can be concluded that the gain of DIY distortion is around twice higher than Behringer distortion, and also changes in frequencies will not affect much in the output voltage, so the gain is more constant in the DIY distortion. The DIY distortion is given 0.48 V (peak to peak) as the input voltage at 330Hz, and the output voltage produced is 4.46 V, so the gain of self-made distortion is 9.3. While for Behringer distortion, the output voltage produced is 2.16 V, so the gain for Behringer distortion is 4.5. At 330Hz, the HBS (harmonic bandwidth spread) for DIY distortion is 2970Hz and the HBS for Behringer distortion is 1650Hz. Overall, DIY distortion has a higher HBS (harmonic bandwidth spread) compared to Behringer distortion, which means that DIY distortion generates a greater distortion effect than Behringer distortion. After comparing DIY distortion and Behringer distortion, the comparison of wood guitar, nylon guitar and mini wood guitar were made. At string E" (330Hz), the HBS for wood guitar is 3960Hz, nylon guitar is 1650Hz, and mini wood guitar is 3960Hz. The results show that nylon guitar has the lowest HBS compared to wooden guitar and mini wood guitar, while mini wood guitar has the greatest HBS among the three guitars./ Dalam penelitian ini dirancang 2 buah gitar elektrik masing-masing adalah nylon block untuk badan gitar dan juga sebuah gitar elektrik dari kayu yang berukuran lebih kecil. Selanjutnya gitar komersial dibongkar untuk diambil komponenkomponennya untuk dipakai mendesain badan gitar yang baru dengan bahan nylon dan badan kayu yang kecil, agar memudahkan gitar untuk dibawa berpergian. Dengan merujuk rangkaian distorsi Behringer, rangkaian distorsi rakitan sendiri kemudian ditambahkan pada gitar tersebut. Sebelum pengujian kualitas gitar, dilakukan pengujian spektral rangkaian distorsi Behringer dan rangkaian distorsi rakitan sendiri menggunakan function generator dan osiloskop. Dari hasil pengukuran kedua rangkaian distorsi tersebut, dapat disimpulkan bahwa hasil rangkaian rakitan sendiri mempunyai gain sekitar 2 kali lebih besar dibandingkan rangkaian distorsi Behringer. Disamping itu, perubahan frekuensi pada masukan rangkaian rakitan sendiri tidak berpengaruh banyak pada amplitudo tegangan keluaran. Saat masukan rangkaian rakitan sendiri diberikan tegangan input 0,48 V (peak to peak) pada frekuensi 330Hz, tegangan keluarannya adalah 4,64 V, jadi gainnya adalah 9,3. Sementara untuk rangkaian distorsi Behringer, tegangan keluarannya adalah 2,16 V, jadi gainnya sekitar adalah 4,5. Pada frekuensi 330Hz, HBS (harmonic bandwidth spread) untuk rangkaian distorsi rakitan sendiri adalah 2970Hz sedangkan untuk rangkaian distorsi Behringer adalah 1650Hz. Secara keseluruhan, rangkaian distorsi rakitan sendiri mempunyai HBS yang lebih besar dibandingkan rangkaian distorsi Behringer, yang berarti bahwa rangkaian distorsi rakitan sendiri mempunyai distorsi yang lebih kuat dibandingkan rangkaian distorsi Behringer. Dari pengukuran HBS pada senar E" (330Hz) dari gitar kayu komersial, gitar nylon dan gitar mini wood, diperoleh gitar nylon mempunyai HBS terendah (1650Hz), dan gitar miniwood mempunyai HBS tertinggi (3960Hz).

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