Principle diagram of wire control headphones

In reality, wire control headphones produced by manufacturers of various brands cannot be used in a universal manner, and purchasing dedicated headphones is expensive. If there are idle wire control headphones on hand, as long as the interface is appropriate, it can be matched with a little change.

Our common wire control headphones, regardless of the interface type (audio interface, USB interface, etc.), basically use a four-line connection, among them, "shared back-to-line Gnd" is the shared back-to-line for the left-right sound channel, microphone, and output control of the headset. This principle is certain, but in order to achieve monopoly benefits, online functions. For example, the plug is used as an example. The plug has four electrodes from top to bottom. If the first and third electrodes are switched, the headset is silent, the wire control is invalid, and the microphone is invalid; if the wiring of the third and fourth electrodes is reversed, the two headphones are silent. When changing, you only need to wire the switch at the micro switch according to the principle diagram.

According to the schematic diagram, it is not difficult to determine the function of each electrode of the wire Control Earphone plug: use an ohm table for measurement. If one of the electrodes does not turn on with the other three electrodes, the electrode is the control pole. In the remaining three electrodes, if the maximum resistance value is displayed between the two electrodes, the two electrodes are the left and right channels of the earphone, respectively, the remaining electrodes share the return line. The maximum value mentioned here is that the coil resistance value of the left-right channel earphone is 0.1-different from the resistance value between any two electrodes in the remaining three electrodes ~ 0.2 Ω.

In the figure, the micro switch is normally closed. When the micro switch is pressed, the four-point hybrid transient connection enables the control pole to have an effective level-low level.