Rahmatina R, Aripin MN, Ikbal M, Deolika A. Implementation of BD139 Transistors and Relay Circuits in Water Machines. JIfoTech [Internet]. 2023Mar.20 [cited 2024Apr.26];3(1):11-8. Available from: https://journal.shantibhuana.ac.id/index.php/jifotech/article/view/579