| 摘要 |
<p>PURPOSE:To improve use convenience of an acoustic apparatus, by applying a sleep output signal of a timer to a sound volume controll circuit, and making a sound volume level at the time of sleep smaller than a sound volume level at the time of alarm. CONSTITUTION:At the time of a sleep mode by a sound controll circuit 18, an output is generated from a sleep output terminal 16 of a timer 15, and a transistor (TR) 20 becomes on. Therefore, a signal from one of a tuner 1, a tape recorder 2 and a photo-player 3, selected by a function switch 4 is attenuated in a fixed ratio by a resistance 19, and the sound volume becomes small. The sleep timer is cut and an electric power source of an acoustic apparatus is cut by a relay contact 11, and thereafter, when the electric power source is turned on again by an output from an alarm output terminal 17, no output appears in the output terminal 16, therefore, the TR20 remains off, and regular sound volume, namely, larger sound volume than that of the sleep time.</p> |
