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Background. A field study conducted by researchers found the balls used by visual impairment students at school basically used the sound by a small bell inside the ball. However, the sound emitted from the ball is very limited, the ball will sound when it is moved. This makes it difficult for students with visual impairments to find a missing ball that not emitted makes a sound. Objectives. A Loud-ball ("L-Ball") is a prototype ball designed by a researcher using an electronic circuit that produces non-stop sound intensity during play. This study focuses on prototype design by considering the selection of mechanically strong lightweight electronic components, such as batteries and buzzers. Methods. The L-ball prototype design uses the main electronic components is a lithium battery and piezoelectric buzzer. Then, the sound intensity measured at different distances by the researchers for the ability of electronic components to emit sound from inside the ball. Impact measurements are also carried out to ensure that the electronic components inside the ball do not dislodge during the use of the ball. Results. The results showed that the maximum L-Ball sound intensity emitted was 64 dB with impact resistance performed 100 times. Finally, the sound emitted is suitable for playing fields with a width of 3 meters and a length of 13.4 meters. Conclusion. L-ball is designed like a ball for visual impairment, the quiet of the stadium is the main requirement the L-ball sound can be heard optimally by all players.

L-Ball: Designing A Novel Sports Electronic Audio Ball for Visual Impairment Student