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How to connect headphone socket

Release time：2019-10-19    Clicks： Click

What are the connection methods and steps of headphone socket, and what are the specific contents? Let's introduce it to you.
Headphone socket manufacturer's connection method and procedure explanation
Earphone socket size: for the 3.5mm stereo earphone socket purchased in the electronic market, there will be a ① ② ③ ④ ⑤ number next to the pin on the bottom of the earphone socket, corresponding to the scale chart. Generally speaking, the earphone adopts a 3-section plug. The diameter of the plug is generally 3.5mm and 2.5mm. Plugs with different diameters correspond to earphone sockets with different diameter holes, so "male" and "female" should correspond.
Sometimes engineers will inevitably encounter some connecting devices when drawing PCB drawings. Many of these devices are made by small manufacturers in China, so it is difficult to ask for standard parameters such as machine scale from manufacturers like foreign ones. Therefore, many times, they need to measure with vernier caliper. In this way, one is that we don't know the pin connection of the connector, which is very simple and wrong; the other is that there is always a mistake in my measurement, and the PCB connector originally drawn can't be pressed. In my opinion, this is one of the gaps between domestic and foreign countries. Not only in the chip, but also in these details we do not do well.
According to the connection of the three section headphone plug, it can be confirmed that the steps of the headphone plug connection are as follows:
Headphone socket manufacturer
Connection method of earphone socket
One is grounded, two is right, and five is left. When the headphone connector is not pulled out of the socket, 2-pin and 3-pin, 4-pin and 5-pin are connected together. Once the connector is pulled out of the socket, 2-pin and 3-pin, 4-pin and 5-pin will be separated. So from the point of view of trivial reliability, the 3-pin and 4-pin should be grounded, so that when the headset is not plugged in, the left and right channel output is grounded, and the trivial output is 0. Many times, we will hang unnecessary 3 feet and 4 feet in the air, so 2 feet and 5 feet are also in the air. The danger is that a large current will be connected from the outside, and then it will be transferred from 2 feet and 5 feet to the board, which will burn the chip.
In addition to the three-stage earphone connector, there are four-stage earphone connector. The four-stage earphone has one more microphone / answer button than the three-stage earphone. The national standard (global mobile phone) defines the left channel, right channel, MIC and ground from the beginning to the end (the tail is on the wired side). Note that the order of the 苹果's four segment headphone connectors is different. From the beginning (tip) to the end are left channel, right channel, ground and Mic.
Power polarity of headphone socket: positive inside and negative outside. It should be noted that the plug is normally positive inside and negative outside, but it is also possible that a small part of the plug made by their own technology is reverse, so to be on the safe side, it is good to measure it with a multimeter before using it to avoid burning the chip.
Above is the headphone socket connection method and steps on the specific introduction.
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