Instructions for determining whether earphone drive-by-wire is qualified:

first measured with a mobile phone, with Apple wire control function measured with iPhone. If the function is qualified in some iPhone cellphone drive-by-wire and the function of wire control is unqualified in some iPhone, the following judgment method is adopted. Similarly, measured with Android mobile phone with Android with controller function (note: it is not judged as unqualified within this range; The earphone plug is directly inserted into the 3.5mm Jack of the mobile phone, instead of being transferred through the adapter), if some Android phones (different models of the same brand or different models of different brands) are qualified by wire control, and some Android cellphone drive-by-wire are unqualified, the following judgment method is adopted.

I. IPhone principle of wire control: 1. Principle of play/pause button: Play/Pause button is an indirect button of the positive and negative poles of the microphone. Touch button and press it. The positive and negative poles are short-circuited to generate a wire control response.

The standard for determining whether the playback/pause button is qualified is: Press button, and the short connection between the positive and negative poles (the DC resistance between the positive and negative poles is not greater than 70 euros) is that the playback/pause function is qualified,

2. Volume plus or minus volume button wire control principle: press the volume plus (or volume minus) to send a certain length of ultrasonic wave, and the mobile phone receives the ultrasonic signal to generate a wire control response.

The standard for determining whether the addition and subtraction volume is button or not is: Press the addition and subtraction volume button to generate an ultrasonic wave of the corresponding length, which is qualified. If no ultrasonic wave is generated or the ultrasonic wave length is incorrect, it is unqualified.

2. Android cellphone drive-by-wire schematic diagram is as follows: M + is the microphone positive pole, GND is the microphone negative pole

1. Press play/pause button, and the DC resistance between M + and GND is within the range of 0-70 Ohm, that is, the play/pause function is qualified, and it is not qualified within this range;

2. Press the volume plus button, and the DC resistance value between M + and GND is within the range of 200-290 Ohm, that is, the volume plus function is qualified, and it is not qualified within this range;

3. Press the volume minus button, and the DC resistance between M + and GND is within the range of 360-690 Ohm, that is, the volume minus function is qualified, and it is not qualified within this range.

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