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What is the difference between a 3.5 mono plug and a 2.5 mono plug?

Update:29 Dec 2020

What is the difference between a 3.5 mono plug and a 2.5 mono plug? Of course, I am not talking about a 3.5mm plug and a 2.5mm plug, but what are the application areas of the two plugs.

The interface of the 3.5 monaural plug is equipped with a standard earphone plug. If the phone is a 3.5 monaural plug, you can also equip high-end earphones. For the 2.5 version, you can only use the mobile phone and the standard earphone. Standard headphones generally do not work well, if you are not very picky about the sound, then it doesn’t matter
It's just that the diameter of the headphone plug is different, one is 3.5MM and the other is 2.5MM.
The 3.5MM interface is suitable for connecting stereo speakers or headphones, and is widely used.
The 2.5MM interface is not universal, if you want to use it, you have to change the plug of the stereo or earphone, which is more troublesome.

The most common 3.5 mono plug is divided into three layers, and there are also two layers. Each layer has a corresponding function. If you want to DIY, you must layer it. The standard distribution is "left and right ground red and white" (from the end to the root are the left channel, the right channel, and the ground wire, in which the left channel is usually red, and the right channel is usually white). Generally, the headset DIY can be connected as shown in Figures B and C (Figure B is a common three-layer connector), and C1 (usually yellow) and C2 (same as C1) are twisted into a strand and 3-0 is the ground wire, R ( The red) line is connected to 3-1 for the right channel, and the G (green) line is connected to 3-2 for the left channel. If it is a four-layer mobile phone headset with a microphone, from the top to the root are left channel, right channel, microphone, and ground.

The most common materials are silver-white and copper-yellow, silver-plated copper, and copper-yellow copper. Since the stability and electronic engineering of silver are better than copper, the user experience of using the 3.5 mono plug device can be upgraded after copper is plated with silver.