Choeisai, K., Prasertcharoensuk, V. and Budboonchu, J. (2015) “A Design of isolated amplifier using feedback signal for solving non- linear of opto coupler device”, Engineering and Applied Science Research, 32(3), pp. 341–351. available at: https://ph01.tci-thaijo.org/index.php/easr/article/view/42339 (accessed: 31 August 2026).