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Almost all HiEnd equipment today uses a ring-shaped power transformer (also called ring cow) and other straighter models still use the traditional square-shaped power transformer (also called square cow). Since Fang Niu's iron core is composed of E-shaped and I-shaped silicon steel sheets? Fang Niu is also called EI Niu. It has been more than a decade since HiEnd equipment was used extensively. General experience tells us that the high-frequency response of Huaniu is better. In addition, Huaniu with the same weight has higher power and dynamic margin than Fangniu. Huanniu generally costs more, and consumers will feel that it is more expensive HiEnd machine has become a matter of course. In fact, from a technical point of view, Huanniu is superior to Fangniu. I am afraid its magnetic flux leakage is far lower than Fangniu, so the wiring in the machine can become more flexible.
However, in recent years, studies have found that Huanniu itself has potential weaknesses. In terms of sound quality, people need to rethink the debate between Huanniu and Fangniu.
Before delving into the pros and cons of both, let ’s take a look at their structure. Let's talk about Fang Niu first. Its coil is wound on a square frame. It is very easy to wind. If you use a special machine, you can wind many at once, so it is cheaper to manufacture. After the coil is wound, the silicon steel sheets are put in order. For the first time, put the E-shaped silicon steel sheet E and I together to form a Japanese character, and for the second turn direction, put the I-shaped silicon steel sheet first, so that I and E together are also a Japanese character, so plum You can stand up until the hollow of the coil frame is filled.
The structure of the ring cow is very different. First of all, we need to roll the long strip of silicon steel sheet into a ring shape. When it is rolled to the required thickness (that is, the required cross-sectional area), we need to put it in Heat it in the stove to set it. After setting, it becomes a ring-shaped iron core, which is then covered with an insulating film, and then the patent leather wire is wound around the ring through the central hole of the iron core. This kind of production requires a special machine and can only be wound every time. A ring cow, so the cost of ring cow is much more expensive.
As for fixing the fire cow on the bottom plate, the ring cow is very simple. Just put a soft piece on the top and bottom of the ring cow, and then add a large "washer" -shaped tablet with a bolt in the center. It can be fixed by passing through the chassis and adding a silk cap. Fang Niu has two fixing methods, horizontal and vertical. Generally, the bile machine uses a horizontal type. The method is to lengthen the four bolts of the tight iron core, and then add a wire cap through the chassis. Others are mostly vertical, with a foot cover on the outside of the Fang Niu, and then fix the foot position of the cover to the chassis with screws.
Since Huanniu is superior to Fangniu in many respects, then some people thought that it would be better to use it as the output cattle of a tube amplifier. However, the effect produced was very disappointing. From the test report, the ring output cattle high frequency response is very high, and the efficiency is also very high, but in terms of hearing, it is strange, and the image is bold. After the machine was replaced with a ring-shaped output cow, the sound of the stone machine changed. This attempt ended quickly, and not many people tried it. But isn't it true that Huaniu can't do export cattle? The answer is money. After special design and processing, the ring cattle can become the best output cattle, but the cost may be dozens of times that of the square cattle. String 8
What recent research has discovered the weakness of ring cow? This depends on the characteristics of the mains electricity we use. In Hong Kong and China, the power supply is 220V, but in theory, 220V is the RMS value, in other words, its highest positive peak and negative peak are 220V × 1.414 = 311V. This is just an ideal value, but in real life, due to the pollution of various industrial equipment and full of various spikes, the positive and negative symmetry of the power supply is often destroyed, and DC offset (DCoffset) occurs. If there is a DC drift of 10V, the positive peak value is 321V and the negative peak value is 301V. Although the 220VRMS AC power is still maintained at both ends of the power supply, 10V DC appears simultaneously. This DC drift can be instantaneous, intermittent and continuous. What is more terrible is that the irregular asymmetry at both ends of the AC has no simple countermeasures, and the magnitude of the DC drift can be several volts or tens of volts.
The DC drift just said is precisely the dead point of Huanniu. It turns out that the core of the ring cow is a complete ring magnetic circuit, so its efficiency is higher, but this core has basically no air gap, the problem comes out, when the coil appears DC, the core is highly efficient The rapid magnetization causes hysteresis. When hysteresis occurs, the efficiency of the fire cow will drop rapidly. In addition, because the core of the ring is insulated from the outside, there is no way to reduce the charge induced by the core. When faced with this situation (in fact, this situation is very common in the city) the sound of the machine using the ring cow will be significantly deteriorated. Sometimes the ringing of cattle or even people produces the phenomenon of tweets.
And Fang Niu? The opposite is true. Its weakness is its low efficiency and its frequency should be narrow, but it is precisely this point that it has a strong immunity to DC drift. It turns out that each piece of Fangniu ’s iron core is composed of an E and an I, and there is no complete magnetic circuit. This is why it is inefficient, but it is because each E and I silicon steel sheet has an air gap The steel sheet cannot be over-magnetized, so it is not easy to produce hysteresis, so this air gap becomes a hysteresis safety valve. Therefore, a little DC drift will not affect the opponent's cattle. Experienced enthusiasts will know that the output cow used for single-ended amplifiers has a large amount of DC passing through. The iron core of this cow is not the EI silicon steel sheet plum blossoms, but the whole group of E on one side. Slices, on the other side is the entire set of I slices.
And through special winding methods, such as two-wire parallel winding, reverse connection, crossover, etc., Fang Niu can achieve 20-30dB higher noise repulsion than Ring Niu. This is remarkable, because 20dB is one hundredth of the original noise, and 30dB is one thousandth.
So, how was the super ring cow mentioned earlier made? The reason is very simple, just add a gap to the iron core and pull the iron core through the lead wire, and then connect it to the chassis to derive the induced charge. This can be said to be easy to understand and difficult to implement. It is necessary to put a gap of 0.02 "on the core of the ring cattle, which is equivalent to the thickness of a piece of paper. At present, only laser can do it. There are no advantages. Whether this approach is worth it is a matter of opinion.
Most of all kinds of audio equipment need electricity. Those who use electricity are generally called active equipment, and some that do not need electricity, such as speakers, are called passive equipment. In the active equipment, except for a small part of which are powered by dry batteries, other things are generally connected to the mains. These equipments require power transformers, which is what we commonly call "fire bulls".
Almost all HiEnd equipment today uses a ring-shaped power transformer (also called ring cow) and other straighter models still use the traditional square-shaped power transformer (also called square cow). Since Fang Niu's iron core is composed of E-shaped and I-shaped silicon steel sheets? Fang Niu is also called EI Niu. It has been more than a decade since HiEnd equipment was used extensively. General experience tells us that the high-frequency response of Huanniu is better. In addition, the same weight of Huanniu has higher power and dynamic margin than Fangniu. Huanniu is generally more expensive and consumers will feel that it is more expensive. HiEnd machine has become a matter of course. In fact, from a technical point of view, Huanniu is superior to Fangniu. I am afraid its magnetic flux leakage is far lower than Fangniu, so the wiring in the machine can become more flexible.
However, in recent years, studies have found that Huanniu itself has potential weaknesses. In terms of sound quality, people need to rethink the debate between Huanniu and Fangniu.
Before delving into the pros and cons of both, let ’s take a look at their structure. Let's talk about Fang Niu first. Its coil is wound on a square frame. It is very easy to wind. If you use a special machine, you can wind many at once, so it is cheaper to manufacture. After the coil is wound, the silicon steel sheets are put in order. For the first time, put the E-shaped silicon steel sheet E and I together to form a Japanese character, and for the second turn direction, put the I-shaped silicon steel sheet first, so that I and E together are also a Japanese character, so plum You can stand up until the hollow of the coil frame is filled.
The structure of the ring cow is very different. First of all, we need to roll the long strip of silicon steel sheet into a ring shape. When it is rolled to the required thickness (that is, the required cross-sectional area), we need to put it in Heat it in the stove to set it.
Talking about Huoxiu
Most of all kinds of audio equipment need electricity. Those who use electricity are generally called active equipment, and some that do not need electricity, such as speakers, are called passive equipment. In the active equipment, except for a small part of which are powered by dry batteries, other things are generally connected to the mains. These equipments require power transformers, which is what we commonly call "fire bulls".