Rattha, Piyanat, Vithaya Chamnanphrai, Angkana Charoenmee, and Juttupong Namsom. 2020. “Guidelines for the Development of Power Loss Reduction Circuits of Class A Audio Amplifiers Using Appropriated Voltage Adjustment Technique With Small Input Signal: Doi: 10.14456/Mijet.2020.7”. Engineering Access 6 (1). Mahasakham, Thailand:30-35. https://ph02.tci-thaijo.org/index.php/mijet/article/view/10.14456.mijet.2020.7.