Patent ID: 9521485
Filing Date: 2016-12-13
CPC Classification: G10K,H01R,H03G,H04R

Claim Text:
1. A voltage supply circuit included in a terminal equipment, the voltage supply circuit comprising: a control unit for controlling a signal output from the terminal equipment; a power supply unit for outputting voltage to an earphone device according to a control signal of the control unit; and a variable circuit unit connected to the power supply unit to convert the voltage output from the power supply unit and transmit the converted voltage to the earphone device, wherein the variable circuit unit comprises: a first resistor connected to the power supply unit to adjust magnitude of the voltage output from the power supply unit; a second resistor connected to the power supply unit to adjust the magnitude of the voltage output from the power supply unit; a third resistor for adjusting the magnitude of the voltage output from the power supply unit according to switching of a first switch; a first capacitor for adjusting any one of a speed of increasing and a speed of decreasing the magnitude of the voltage output from the power supply unit; a second capacitor for maintaining the voltage output from the power supply unit to a predetermined value; and the first switch arranged between the power supply unit and the second capacitor and switched according to a control of the control unit.