Switching circuit and electronic device using the same
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United States of America Patent
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May 7, 2013
Grant Date -
Apr 19, 2012
app pub date -
Dec 13, 2010
filing date -
Oct 18, 2010
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronic device includes an audio power amplifier used to output a left and a right channel audio signal, an earphone jack assembly, and a switching circuit automatically switching between a speaker mode and an earphone mode. The audio power amplifier includes a control pin enabling the audio power amplifier to be electrically connected to the speaker. The control pin activated at a low level and disabled at a high level. The switching circuit is capable of enabling the control pin to switch between the low level and the high level. The switching circuit includes a power supply, a first resistor, a second resistor, a third resistor, and a diode. The resistance of the third resistor far exceeds that of the first resistor.
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