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Brief description of the drawings
1 is a circuit diagram of a stereo headphone jack, FIG. 2A is a diagram showing a stereo
headphone plug, FIG. 2B is a diagram showing a monaural plug, and FIG. 3 is a state in which the
stereo headphone plug is inserted into the stereo headphone jack FIG. 4 is a circuit diagram, FIG.
4 is a conventional circuit diagram in which a monaural plug is inserted into a stereo headphone
jack, and FIG. 5 is a circuit diagram showing one embodiment of the present invention. J ······
stereo headphone jack, P Engineering ...... stereo headphone plug, P2 ······ mono plug, T ······
detection circuit, 4. 4 、6. 6 ・・・・・・アンプ。