SUPRIYONO; SANTOSO, Teguh. Four Digital Electronic Combination Key Using A 74HCT688 Comparator IC Accompanied with An Alarm as A Security. Best : Journal of Applied Electrical, Science and Technology, [S. l.], v. 5, n. 2, p. 39–41, 2023. DOI: 10.36456/best.vol5.no2.7798. Disponível em: https://jurnal.unipasby.ac.id/best/article/view/7798. Acesso em: 7 aug. 2026.