The Role of Bipolar Junction Transistors (BJT) in Audio Signal Amplification for Bluetooth Speaker

Authors

  • Anggun Nurqoirun Nisa Institut Teknologi Kalimantan
  • Inova Asia Awantari Institut Teknologi Kalimantan
  • Muhammad Fajri Ilham Institut Teknologi Kalimantan
  • Aditya Gadhan Natha Harahap Institut Teknologi Kalimantan
  • Albathina Novirna Institut Teknologi Kalimantan

Keywords:

Bipolar junction transistor (BJT), Bluetooth speaker, Audio signal amplification, NPN common emitter, GeOl

Abstract

The development of Bluetooth technology has helped drive advancements in wireless audio devices, particularly in Bluetooth
speakers. The Bipolar Junction Transistor (BJT) has become an important component as an audio signal amplifier. This article
discusses the role of BJT in strengthening weak audio signals into loud and clear sounds. The study in this article reviews the
characteristics, working mechanisms, as well as the advantages and disadvantages of BJTs using the commonly used NPN
common emitter configuration. In addition, this article also discusses the thermal response of BJTs and the influence of
temperature on their performance, as well as the fabrication process of Germanium-on-Insulator (GeOI) as an alternative to
improve BJT performance. The results show that BJTs have good signal amplification capabilities but are vulnerable to high
temperatures.

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Published

2025-12-30

How to Cite

Anggun Nurqoirun Nisa, Inova Asia Awantari, Muhammad Fajri Ilham, Aditya Gadhan Natha Harahap, & Albathina Novirna. (2025). The Role of Bipolar Junction Transistors (BJT) in Audio Signal Amplification for Bluetooth Speaker. Metallurgical Engineering and Materials Innovation, 1(2), 11–25. Retrieved from https://journal.itk.ac.id/index.php/memi/article/view/8481381

Issue

Vol. 1 No. 2 (2025): MEMI Journal

Section

Articles