The microphone circuit of the monitor of the present invention, the device of the present invention and the audio card (1) for supplying a voltage through the R (Right) terminal; A first load (4) connected in series between the R (Right) terminal of the audio card (1) and the built-in microphone (2); The R (Right) terminal of the audio card 1 and the second load 5 connected in series with the inlet end 3 of the external retractable microphone, the R (Right) of the video card 1 By supplying the voltage output from the terminal to the built-in microphone 2 and the inlet end 3 of the external draw-in microphone, the condenser-type built-in microphone as well as the condenser-type external draw-in microphone can operate.
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