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All Journal JFA (Jurnal Fisika dan Aplikasinya)
Puspitasari, Nurrisma
Departemen Fisika, FSAD-ITS
Physics

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Optimization of Audio System Wireles Transmitter Using Green Laser Puspitasari, Nurrisma; Dwiputra, Adnan Wahyu; Sudarsono, Sudarsono; Yudoyono, Gatut; Prajitno, Gontjang; Indarto, Bachtera
Jurnal Fisika dan Aplikasinya Vol 20, No 3 (2024)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v20i3.21861

Abstract

Abstract: Nowadays, many activities are done digitally using wireless technology. Wireless technology is the mainstay of communication, but along with the development of the times, there is a wireless technology that utilizes LASER. There has been quite a lot of research on audio systems with wireless transmitters, but none have analyzed the potential of green lasers to obtain the optimal wavelength for communication. This study aims to design a voice transmission system using a laser, determine the relationship between input voltage and laser light intensity, and compare the output frequency with the input frequency. There are three types of measurements: light intensity and distance, laser diode voltage and intensity, and output frequency compared to input frequency. The audio input signal from the source is modulated and transmitted through a laser light medium. The laser beam is then fired into a receiver circuit that can demodulate the signal which is then sent to the output device in the form of a speaker. The study found that the output frequency had the highest error percentage of 38.70% at 125 Hz and the lowest error percentage of 0.07% at 500 Hz when compared to the input frequency. The biggest mistake comes from the volume dropping at a low frequency. The oscilloscope reading is not accurate due to the smaller volume, which leads to a high deviation value and affects the system performance negatively.
Co-Authors Bachtera Indarto, Bachtera Dwiputra, Adnan Wahyu Gatut Yudoyono Gontjang Prajitno Sudarsono