소리가 들리긴 했지만 견고하지는 않았고, 브레드보드에 스피커를 설치한 상태였습니다. 스피커를 설치하면 3mm 아크릴 상자 안쪽에 스피커가 붙어 있기 때문에 음향 효과가 들리지 않을 위험이 상당히 커 보였습니다. 음량은 전류에 정비례합니다.

It was audible, but wasnt exactly robust, and that was with it into my breadboard. Installed, the speaker was going to be stuck on the inside of a mm acrylic box, so it seemed like there was significant risk of the sound effects being inaudible. Sound volume is directly proportional to current.