Are 9v and 12v power supplies common?

9v and 12v power supplies are not universal. After all, they are two specifications with different voltages and different powers. However, in actual use, they are interchangeable in many cases. After all, the voltages of the two are almost the same, especially the 12V powered router uses 9V power supply. It will not make any difference if you try it. harm.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

Are 9v and 12v power supplies common? I believe that many netizens are still not clear about this problem, but they are not using the same power supply and dare not try it easily, so today I will analyze the problems of 9v and 12v power supplies, hoping to help everyone.

Strictly speaking, they are not universal. After all, they are two specifications, with different voltages and different powers. But in actual use, they are interchangeable in many cases. After all, the voltages of the two are almost the same. Especially the 12V powered router uses 9V power supply, so there will be no harm if you try it. I have a Huawei router at home that has been powered by 9V for more than a year and it has always been very good. I've also tried it in reverse, and there's no problem and it can be used normally.

The reason is that the first is that the router itself is not very powerful and does not require high power supply; the second is that the power supply voltage requirements of current equipment are also very wide, because whether it is 12V power supply or 9V power supply, the internal power supply of the router is It is necessary to convert the input voltage, because the working voltage of the router is 5V and 3.3V, as shown in the red circle in the figure below:

Whether it can be universal first depends on the power supply Whether the diameter of the plug is the same, whether the positive and negative poles are the same, and then the voltage is considered. What voltage does the manufacturer use for power supply? One is habit. For example, TP_LINK basically uses 9V, while Huawei basically uses 12V. The other is that for the same current, high voltage can provide more power, so 12V is used for high power; Professional routers generally use 220V AC power directly.

I observed the home routers in the mall. The diameter of the power plug is basically the same (5.5*2.1), and the positive and negative poles are also positive () on the inside and negative (-) on the outside. This paves the way for interchangeability. However, you still need to look at them during actual use to avoid mistakes. Different polarities are definitely not interchangeable.

Most power adapter interfaces are DC plugs 5.5*2.1, where 5.5 refers to the outer diameter of the power adapter plug 5.5mm with a tolerance of ±0.05mm, and 2.1 refers to The inner diameter of the plug of the power adapter is 2.1mm and the tolerance is -0/0.1mm, that is, the inner diameter range is 2.1-2.2mm. The inside of the power adapter plug is the positive pole, and the outside is the negative pole (of course there are also a small number of reverse poles). See the signs indicating the positive and negative poles in the picture:

So, if you don’t have it at hand, If you have a matching power adapter, you can also try it.

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