Introduction to Installation and Connection Method of Earphone Socket
Release time：2019-08-28 Clicks： Click
How to install and connect the headphone socket? We will give you detailed details below.
Headphone socket size: 3.5mm stereo headphone socket bought in the electronic market, from the foot of the bottom of the headphone socket will have the number of (1) and (4) and (6) corresponding to the size map. Generally speaking, headphones use three-segment plugs, the diameter of which is 3.5mm and 2.5mm. Different diameter plugs correspond to headphone sockets with different diameter holes, so "male" and "female" should correspond.
Sometimes engineers will inevitably encounter some connectors when drawing PCB drawings. Many of these devices are made by small manufacturers in China, so it is very difficult to ask the manufacturers for specifications such as machine size and so on, so in many cases, they need to measure them with vernier calipers. This will form, first, we do not know the pin connection of the connector, it is easy to connect errors; second, I measured, there are always errors, the original drawing of the PCB connector can not be pressed. I think this is one of the gaps between China and foreign countries in the standardization of plug-ins and the completeness of dimension specifications. Not only in terms of chips, but also in terms of these details.
According to the connection of the three-segment headphone plug, the connection method of headphone socket can be determined as follows:
Connection method of headphone socket
One foot is grounded, two feet are right and five feet are left. When the headphone connector does not pull out the socket, two feet and three feet, four feet and five feet are connected together, but once the connector pulls out the socket, two feet and three feet, four feet and five feet will be separated. So from the perspective of piecemeal reliability, three feet and four feet should be grounded, so that when the earphone is not plugged in, the left and right channel output is grounded, and the piecemeal output is 0. Most of the time, we will hang unnecessary 3 feet and 4 feet, SO 2 feet and 5 feet are also hanging, so the risk is that in case of a large current from the outside, it will pass from 2 feet and 5 feet to the board, which will burn the chip.
In addition to the three-segment headphone connector, there are four-segment headphone connector. Four-segment headphone connector has one microphone/answering key more than three-segment headphone connector. The definition of national standard (most mobile phones) from beginning to end (the tail is the wired side) is: left channel, right channel, MIC, ground. Note that the order of the four-segment headphone connectors on the 苹果 is different. From the beginning (tip) to the end, they are left, right, ground and MIC.
Headphone socket power polarity: positive and negative inside. It should be noted that the plug is normal inside and outside positive and negative, but it may also be a small part of the plug manually made by themselves is reverse, so as to be safe, it is good to use a multimeter before use, in order to avoid burning the chip.