Gozali, M. SyafeiRidwan, RidwanKadipa, Rahmanitya2022-11-032022-11-032015-01-10https://repository.polibatam.ac.id/xmlui/handle/123456789/336Every years students electronics engineering was increased. With implementations increase students then instrumentation laboratory was terminate. For using instrumental in the laboratory decreased quality because many instruments was malfunction. In this final project litterateur was design a “Trainer Kit Emergency Lamp” for helping students in the practice power electronic. This trainer kit emergency lamp have two system such as charging system (baterry charger) and switching system (relay). For charging system (battery charger) using voltage comparator IC CA3140 with histerisis, while switching system in the trainer kit have function for automatic switch between trainer kit with emergency lamp. Histerisis in the battery charger have function for voltage comparator battery. Voltage comparator charger battery is a 12,09 volt DC. When condition battery voltage under 12,09 volt DC then charger battery will be charging battery until battery voltage was 12,09 volt DC. When voltage battery was 12,09 volt DC it will be no longer charging for battery.idTeknik ElektroElektronikaTeknik dan Ilmu yang BerkaitanEngineering and Allied OperationsThesis