| 摘要 |
PURPOSE: A circuit for outputting sound of a radio-combined earphone is provided to separately listen to mono-type voices outputted from a cellular phone by left and right earphone speakers, and to separate an FM stereo radio broadcasting output from a cellular phone call voice output. CONSTITUTION: A switching unit(100) converts an output voltage into the first or the second voltage value, and switch-outputs the converted voltage value through an earphone jack connector(200). A power cut-off unit(300) is switched according to the output voltage value of the switching unit(100), and controls an output of a radio driving voltage as a radio power input terminal. A voice output circuit(400) separately outputs mono-type voices outputted from a cellular phone by left and right earphone speakers(50), respectively. A radio circuit(500) outputs an FM stereo radio broadcasting while waiting for a cellular phone call.
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