회로 수정 하고....
소리 듣기....
https://www.youtube.com/watch?v=PNehlsgQOvw
https://www.youtube.com/watch?v=LW7UfJ3BRGs
https://www.youtube.com/watch?v=86JI7GtTub8
https://www.youtube.com/watch?v=AkEqR1AMqGk
회로 수정 하고....
소리 듣기....
https://www.youtube.com/watch?v=PNehlsgQOvw
https://www.youtube.com/watch?v=LW7UfJ3BRGs
https://www.youtube.com/watch?v=86JI7GtTub8
https://www.youtube.com/watch?v=AkEqR1AMqGk