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7#
发表于 2012-2-25 16:21:49
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只看该作者
来自: 江苏连云港 来自 江苏连云港
用这个图,配上这段话,大概能理解
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.
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