| 摘要 |
<p>PURPOSE:To protect a speaker against an excessive input by facilitating the connection of a speaker system by coupling a plug directly with the speaker while releasing wiring extending from a speaker connecting terminal to the speaker through a switch when the plug is inserted into a jack. CONSTITUTION:Terminals provided on the rear surface of an amplifier 1 and terminals 8 provided on a speaker box are connected via an ordinary speaker code, so that a speaker 7 can be driven. Since a protective resistance 10 is connected in series to the speaker 7, the breakdown of the speaker 7 due to an excessive input is evaded. On the other hand, the standard stereo plug 12 of the cord is inserted into a headphones terminal 4 provided on the front surface of the amplifier 1, and other plugs 13 and 14 are into the switch-attached jack 9 of the speaker box. Consequently, the plugs 13 and 14 press switch pieces 9a, which flex down to separate contacts 9b. Thus, the wiring from the terminals 8 to the speaker is released and the plugs 13 and 14 and speaker 7 are connected directly.</p> |
