Syifaul Fuada, and Devi Puspita Dewi. “How to Teach IC Timer NE 555 for Future STEM Teachers Through Virtual Lab”. International Conference on Elementary Education 5, no. 1 (June 28, 2023): 645-652. Accessed May 14, 2024. http://proceedings2.upi.edu/index.php/icee/article/view/3149.