Anggun Nurqoirun Nisa, Inova Asia Awantari, Muhammad Fajri Ilham, Aditya Gadhan Natha Harahap, and Albathina Novirna. “The Role of Bipolar Junction Transistors (BJT) in Audio Signal Amplification for Bluetooth Speaker”. Metallurgical Engineering and Materials Innovation 1, no. 2 (December 30, 2025): 11–25. Accessed January 21, 2026. https://journal.itk.ac.id/index.php/memi/article/view/8481381.