Active Filter Analysis on Designing Electronic Stethoscope. Jurnal Elektronika dan Telekomunikasi, [S. l.], v. 19, n. 2, p. 51–56, 2019. DOI: 10.14203/jet.v19.51-56. Disponível em: https://jurnalet.brin.go.id/jet/article/view/278. Acesso em: 9 jun. 2026.