| 摘要 |
PROBLEM TO BE SOLVED: To provide a microphone device with a light-emitting device that can suppress noise generation caused by an operation to turn ON and OFF the light emitting element.SOLUTION: The present invention relates to a microphone device 1 comprising: an audio output circuit 6 which performs balanced output of an audio signal, output from a condenser microphone unit, from a balanced transmission line; a balanced output terminal 8 comprising a hot terminal, a cold terminal and a ground terminal connected to the balanced transmission line; a power supply circuit 7 supplying phantom electric power from the balanced output terminal to the audio output signal via the audio transmission line; and a display circuit 9 including a light emitting element which illuminates and does not illuminate according to an operation on a manual switch S1. A display circuit 9 comprises: constant current elements CR3, CR4 generating a constant current from the balanced transmission line; a constant voltage element Z2 connected to the constant current element and generating a constant voltage; and light emitting elements D11-D14 connected to the constant current element and applied with the constant voltage generated by the constant voltage element.SELECTED DRAWING: Figure 3 |
