DESIGN AND MANUFACTURE OF DIGITAL CIRCUIT EXPERIMENT KIT FOR LEARNING AND TEACHING PURPOSES

Abstract

This study aims to design and fabricate an integrated, modular, and multi-functional digital circuit experimental kit to meet the requirements of intuitive practical training and to enhance hardware durability in educational environments. The implementation methodology involves analyzing the detailed course syllabus, selecting appropriate components, designing schematics in Proteus software, developing 3D models and printed circuit boards (PCBs) in Altium Designer, and fabricating the hardware enclosure using laser cutting and engraving technology. The novelty of this research lies in the integration of an active protection system against short circuits, reverse polarity, and overcurrent using polymeric positive temperature coefficient (PPTC) resettable fuses for each individual functional block. Experimental results demonstrate that the integrated 5.0 VDC power supply operates stably with a voltage drop of less than 1.6% under full load (0.8 A), and the clock frequency is precisely adjustable from 1 Hz to 102 kHz with a rise time of 24 ns. The logical testing success rate for the practical exercises reached 100% over 20 continuous test cycles. A survey evaluation conducted on 56 students indicated that the device effectively supported the reinforcement of theoretical knowledge, achieving an average score of 4.21/5 (Cronbach’s Alpha = 0.84). The research findings provide a cost-effective, self-built pedagogical tool that enhances teaching and learning efficiency while fostering student engagement and interest in the subject matter.