Teerachtragoon N. Construction of a Low-Cost Lock-in Amplifier for Physics Experiments in Undergraduate Laboratory. CUAST J. [internet]. 2026 Jun. 23 [cited 2026 Aug. 29];15(2):e2177 . available from: https://so19.tci-thaijo.org/index.php/CUASTJournal/article/view/2177