H. . Muhammad Salleh and M. N. . Yahya, “Initial Study of Converting Sound Energy into Electrical Energy”, JSMT, vol. 2, no. 1, pp. 1–7, Oct. 2022, Accessed: Aug. 17, 2024. [Online]. Available: https://publisher.uthm.edu.my/ojs/index.php/jsmt/article/view/10327