| 摘要 |
PROBLEM TO BE SOLVED: To provide a slot machine 1 capable of preventing malfunction of a speaker protection circuit 56 caused by fraudulently-irradiated electric waves.SOLUTION: The slot machine 1 includes a speaker 20 for outputting various types of sounds, an amplifier circuit 55 connected to the speaker 20, and the speaker protection circuit 56 for protecting the speaker 20. The speaker protection circuit 56 includes: a DC detection circuit 56a that, when detecting abnormality of voltage output from the amplifier circuit 55, outputs a Hi-level voltage signal; and a protection signal output circuit 56b that, when the Hi-level voltage signal is input, outputs a protection signal for cutting off the power supply to the amplifier circuit 55 by a turn-on operation of an N-channel type filed effect transistor Q11. |
