Transformer is a device for raising or lowering the voltage by using Faraday's law of electromagnetic induction. Transformers usually contain two or more coils. The main purpose is to change the voltage of alternating current, to change the impedance and the separation circuit.

Transformer according to use can be divided into: distribution transformers, power transformers, sealed transformers, combined type transformer, dry type transformer, oil immersed transformer, single-phase transformer, electric furnace transformer, rectifier transformer.

To make the circuit to achieve stability, we need to choose the appropriate transformer. Below for you to introduce the transformer selection of a few problems:

First, the transformer production, the coil winding machine and manual winding what are the advantages and disadvantages?

Is around the transformer has the advantages of high efficiency and appearance beautiful, but around of tall small holes in the toroidal transformer, but more trouble and reliability of insulation treatment process in the anti than manual bypass system in place. Hand winding can be transformer magnetic flux leakage was very small, the in the process of winding can according to the number of turns of the coil layout at any time to be adjusted, so the real hi - end transformer must be pure manual winding, pure hand wound only drawback is low efficiency, slow speed.

Two, ring, EI type, R type, C type of power transformer which is the best?

They each have their own advantages and disadvantages, and no one is best to say, so strictly speaking, what kind of transformers can do the best. Structurally, the ring to do magnetic flux leakage minimum, but sound sense of EI type can the sense of intermediate frequency density do better. Single magnetic saturation, EI type than the ring, but the efficiency is better than EI type ring. In spite of this, the key to the problem is can you can not exceed the full play to their respective advantages, and this is good transformer is the most fundamental.

The imported amplifier in the current application of transformer is still the mainstream, it illustrates a problem. Evaluation on the transformer fancier to be objective and fair, you can't take a not do something for reference and say it is not good. Some people say that the annular transformer magnetic saturation, why don't you go to think of a way to do it is not easy to magnetic saturation? And originally through technical means can do this point. Not to work hard or blindly in order to save costs, then it is certainly easy to magnetic saturation. Similarly, as long as you carefully produced, EI type transformer efficiency is also able to achieve very high.

The quality of transformer has a great influence on the sound, because the transmission power of the transformer is closely related to the core and the coil, and the transmission rate of the transformer plays a decisive role in the sound. Like EI transformer, people usually feel that it is relatively thick, high frequency is relatively slim, why? Because it's relatively slow transmission speed. While the ring? Low frequency and high frequency in the more fierce, a little weaker, why? Because the transmission speed is very fast, but if by changing the structure of the effective, you can do ring, and EI type is very perfect, so the key is to see how you do.

But at least it can be certain that the R transformer is not too easy to do. Use it to small current pre amplifier and a CD player power supply can also, if used as the power supply of the power level, more serious defects. Because the R type transformer structure form is not very easy to change, and ring, and EI type is relatively easily through changing the structure to achieve the goal of sound. The R type transformer production of power amplifier power, usually sounds compaction and the lack of Reiki, low frequency are often not jumping ability and become more hard.

Toroidal Transformer

Three, transformer iron core silicon steel sheet with the bigger the better?

No, the size of silicon steel silicon content on the quality of the transformer is not very large, and there is no orientation and orientation and the model has a relationship with the iron core. Second, even if the same model of the iron core if you process is not good, the quality of the difference is very large, and sometimes even as high as forty or fifty of the difference.

Iron core of good and the same material the heat treatment and the line winding process is critical, good heat treatment only need a small 10mA magnetizing current can reach 15000 Gauss, and bad heat treatment may to 50mA of excitation current to achieve the corresponding 15000 Gauss, between the two disparities is great. From a professional point of view to determine the core of good and bad, mainly through the exciting current, iron loss and saturation parameters of several indicators to undertake a comprehensive price.

Belt type transformer silicon steel sheet four, if adopted the splicing process, is not a means of quality is certainly not good?

Also cannot treat as the same, but stitching on the axial head is not easy to too much, because more than one axial a magnetic flux leakage point so that the joints point is best not more than 2 - 3. Production process where broken stitching are to give the first after pickling treatment, but the manufacturing of high-end audio equipment toroidal transformer, strictly speaking or by stitching the silicon steel sheet is the best, the process will be more secure.

Five, the transformer in the silicon steel sheet material what is the stress?

Because of the loss of silicon steel in alternating magnetic field is very small, so the transformer is mainly used as a magnetic material. The silicon steel sheet can be divided into two types, hot rolling and cold rolling, the cold rolled silicon steel strip has the advantages of small volume, light weight and high efficiency because of its high magnetic conductivity coefficient and low loss. The properties of the hot rolled silicon steel strip are slightly inferior to that of the cold rolled silicon steel strip

The ordinary type EI transformer is