Patent ID: 9736566
Date: 2017-08-15
CPC Classifications: G06F,H03G,H04M,H04R

Claim:
1. An earphone line control device, comprising: a power supply management unit, a filter unit, a switching circuit and a control unit, wherein the switching circuit comprises a switch in series with a first resistance, a first end of the power supply management unit and an end of the filter unit are both connected to a power supply, a second end of the power supply management unit is connected to a first end of the control unit, the other end of the filter unit is connected to a second end of the control unit, a third end of the power supply management unit is connected to ground, a third end of the control unit is connected to ground, an end of the first resistance is connected to the power supply, the other end of the first resistance is in series with an end of the switch and connected to a fifth end of the control unit, and the other end of the switch is connected to a fourth end of the control unit; when the switch is turned off, the control unit outputs a preset coded pulse signal; wherein the power supply management unit comprises a diode, a second resistance and a power supply capacitance; an anode of the diode, an end of the second resistance, and an end of the power supply capacitance are all connected to the power supply, a cathode of the diode and the other end of the second resistance are both connected to the first end of the control unit, and the other end of the power supply capacitance is connected to ground.