Using a 1/8-in. (3,5 mm) stereo headphone jack, the control switch is closed when no plug is inserted. When
closed the 100-k Ω /1-k Ω divider pulls the SE/ BTL input low. When a plug is inserted, the 1-k Ω resistor is
disconnected and the SE/ BTL input is pulled high. When the input goes high, the OUT- amplifier is shut down
causing the speaker to mute (open-circuits the speaker). The OUT+ amplifier then drives through the output
capacitor (C o ) into the headphone jack. 作者: 新技电脑 时间: 2012-2-25 16:26
用一个八分之一英寸(3.5毫米)的立体声耳机插口,当插头没有插进去的时候控制开关是关闭的。当关闭时,100千欧/1千欧的分压器把SE/BTL拉低。当插头插上的时候,一千欧电阻被断开,SE/BTL输入被拉高。当输入变高时,OUT-放大器被关闭,导致喇叭静音(喇叭开路)。OUT+放大器就被驱动通过电容(C0)进入二耳机插口。作者: 麦毅诚 时间: 2012-2-25 16:34
HD音频有设备插入检测!作者: 新技电脑 时间: 2012-2-25 17:51