There is a crystal factory to make filters, LT455EW LT480EU these two ceramic crystals? The price is

LC filter is also called 0 no L source filter, is the traditional harmonic compensation device, so 7 is called 8 no K source, as the name suggests H The device does not need to provide power supply, the device is composed of filter capacitors, reactors and resistors are appropriately combined, and B harmonic source in parallel, in addition to the filtering effect, but also take into account the need for no V power compensation, it has the advantages of simple structure, less equipment investment 5, higher operation reliability, lower operating costs, etc., and is widely used. The quartz crystal filter is a bandpass or bandstop filter composed of a plurality of y-pairs of metal electrodes arranged on the surface of the quartz substrate 6. It uses the energy of the piezoelectric effect to fall into the z theory, selects the number of g of the electrode oscillator g, the return frequency and the electrode oscillator t spacing, controls the acoustic coupling of the ultrasonic wave, and achieves the purpose of filtering from 1.

It is characterized by a steep frequency selectivity of 10s 5, low loss, good stability, high stopband attenuation, and has been used in mobile communication equipment 8 large U amounts, and is a primary medium 4 frequency filter that must not be less than 8, which plays an important role in improving the sensitivity of the whole machine and the ability to resist interference v . The practical application of foreign MCF products is 1 water 1 level for 0 in 7 hearts and 6 frequencies in QMHZ 000MHz, channel spacing, the minimum R package ruler 2 inches K is 38mm 2mm, and the weight is only 8 for the development of new piezoelectric materials, expanding bandwidth, reducing 1 delay fluctuation in 4 bands, increasing attenuation outside C bands, expanding and improving the frequency point and R linearity in 5 frequencies, packaging monolithic 5 feet 7 inches G into a S step small J-shaped 7 and chip 8 type 3. The ceramic filter is designed and manufactured by using the characteristics of low loss, high dielectric constant, low frequency temperature coefficient and thermal expansion coefficient of ceramic materials, and can withstand high power3, and is composed of several longitudinal multi-stage series or parallel trapezoidal lines of wavelength 3 type resonators.

Its significant characteristics are small insertion M loss, good power resistance, narrow bandwidth, especially suitable for portable, automotive A**, no I-line radio, no T-rope ** to 0 and C a P integrated 8 transceiver dual 5 F device and other progressive coupling filters. The most produced abroad is the 000MHz 1GHz range of 1 series of EMI dielectric 6 quality filter, its technical indicators are 3 insertion loss 2dB 0dB, ripple small P at Y3dB, voltage standing wave ratio 0 approx., out-of-band suppression in the specified frequency band 8 up to 20dB to 2 W. Some of the special requirements can reach about 80db, and the filtering characteristics are excellent.

The 8-way development direction is to use new dielectric 4-quality materials and other resonant modes to design and fabricate a new type of miniaturized 2, chip-3-style4, low insertion loss, high attenuation, and high-performance EMI dielectric 8-quality filter.

q┟╩bぇdfl┊kヘq┟╩xイヮctü

Yes, smart meter, how much is yours?

Ceramics are not crystals. The crystal characteristics are as follows:

1. The crystals formed by natural condensation and without external interference have a neat and regular geometric shape, that is, the self-normity of the crystal.

2. The crystal has a fixed melting point, and the temperature remains constant during the melting process.

3. Single crystals have the characteristics of anisotropy.

4. The crystal can make X-ray diffraction occur regularly. Whether X-ray diffraction can be produced on a macroscopic scale is the main method for determining whether a substance is a crystal or not.

5. The crystal plane angle corresponding to the crystal is equal, which is called the conservation of the crystal plane angle.

Yes!!! Pretty sure.

I am a student of ceramic materials, ceramics are fired at a certain temperature, and the initial powder is reacted or grown to form grains at a certain temperature. These grains are all crystalline. However, it is undeniable that in an unbalanced growth environment, there will be a small amount of amorphous in the crystal gap.

Evidence: The composition in ceramic materials can be judged based on XRD (X-ray diffraction), only crystals can make peaks in XRD, amorphous cannot.

The composition of ceramics consists of crystalline phase, glass phase, and gas phase.

The crystalline phase is the grain that is bonded together by an amorphous glass phase, and the void between some of the grains is not filled by the glass phase but by air, which also produces the gas phase.

So ceramics are incomplete crystals with a single chemical composition, which will show some properties of crystals, but they are not crystals.

Ceramics are typical polycrystalline with short-range ordered and long-range disordered structures. Solid splitting and amorphous, crystals are divided into single crystal and polycrystalline, the representative material of single crystal is metal, and the representative material of amorphous is glass.

No. Ceramics are mixtures, and crystals can be divided into four categories according to their structure, particles, and forces: ionic crystals, atomic crystals, molecular crystals, and metal crystals. So it's pure.

Each has its own advantages and disadvantages, otherwise the "bad" ones would have been eliminated long ago.

Ceramic filters are inexpensive; The crystal filter has a high q value and a narrow bandwidth; The frequency of the LC filter is adjustable.

The only thing they have in common is the use of the piezoelectric effect.

But these are two completely different components, one is a quartz crystal resonator and the other is a ceramic filter, the working principle and application are different, and there is not much comparison.

Quartz crystal resonator uses the piezoelectric effect of quartz wafers to convert the mechanical energy of wafers into electrical energy. It is equivalent to the inductance in an oscillating circuit in a circuit, and because the Q value is high, the stability is quite good. The oscillation circuit acts as a signal source, converting the DC signal into an AC signal.

Ceramic filter is to filter the AC signal in the circuit to filter out the frequency signal that is not used. This is not the same function as a quartz crystal oscillator. Although it also uses the piezoelectric effect of ceramic wafers, it mainly uses the energy trapping principle, which is very similar to the quartz crystal filter, but the working mode of the quartz crystal resonator can be said to be the opposite.

So, they are different elements and are not comparable at all.

Ceramic crystal oscillators and quartz crystal oscillators work in the same way and have the same effect, which can be compared. The main difference is that the frequency stability of the quartz crystal resonator is as high as parts per million (ppm), and the frequency stability of the oscillator can reach the order of -6.

In the case of temperature-compensated oscillators, it can also reach the order of -7. If it is a thermostatic oscillator, it can achieve the order of -8 -9, and a multi-layer thermostatic oscillator can reach the order of -9. As a system clock, it can reach hundreds of years without missing a second.

Used as a missile or in aerospace, it can fly tens of thousands of kilometers with an error of less than one meter.

The frequency stability of ceramic resonators is only a few thousandths. The ratio with quartz crystal resonators is obviously much worse. However, ceramic resonators are characterized by easy vibration and low price.

It is used in circuits that do not require too much clock, and has an advantage over quartz crystal resonators. Such as TV remote control, etc.

1 Crystals are microscopically said to be substances in which atoms or molecules are arranged periodically, and macroscopically, crystals have a fixed melting and boiling point, so "crystalline" and "amorphous" are not inherent properties of matter. To add to this, solids are divided into three forms: crystalline, quasicrystalline, and amorphous.

2. The crystalline state and amorphous state of the same substance can be converted into each other, and there can be many crystalline states of the same substance, and different crystalline states can also be converted into each other. There are many conditions for the transition between crystalline and amorphous states, such as temperature, pressure, etc. As for the irregularly shaped solids that you are talking about by rapid solidification, which is the amorphous form of matter, this may or may not be related to matter.

Agate is a colloidal condensation of silica, of course, a crystal, which has a fixed melting point.

3. By coagulation, solidification, and precipitation, can any pure substance get its crystals? Regarding this question, the answer is also uncertain, it may be crystalline or amorphous, such as salt, which precipitates crystals, while paraffin, whether it is sublimation or precipitation, is normally amorphous.

4. A macroscopic feature of the crystal is that it has a fixed shape, which is not artificially given, but is spontaneously formed in the process of crystal growth. According to you, anything can have a fixed shape. Hehe, salt grains are crystals, and ideally they can grow into regular blocks, I don't believe you can try, but the strict conditions for thinking like this.

I've used to get khso4 crystals in the lab, hehe, kdp crystals.

5 Only covalent bonds are directional, so to speak. Things like ionic bonds, metallic bonds, and the like are not directional.

6 On why metals in the molten state can form crystals no matter how they solidify, but ionic molecules and atomic compounds are not necessarily? This may have something to do with the nature of the metal, and I haven't seen an example of this, so I don't know under what circumstances the metal will be in an amorphous state. I know that silica is amorphous under certain circumstances.

Hehe, crystallography is a very deep knowledge.

Here's my summary based on what I've learned, and there may be something wrong, but I hope it helps.

Accumulate by your own classification. For example, most metals are crystals.

Amorphous: Crystal.

Rosin paraffin. Crystals: Cheese, table salt, aluminum.

Non-crystalline: Cheese.

Rosin paraffin. There is no fixed melting point.

Crystals: Crystal table salt aluminum.

There is a certain melting point.

1. "Crystalline" and "amorphous" are not intrinsic properties of matter.

No. Crystalline and amorphous are just a classification of solids, which are distinguished according to whether the appearance is regular and whether the microscopic shape is regularly arranged.

2. How can the crystalline and amorphous forms of the same substance be converted to each other?

It can be transformed by heating the melted process.

3. Is the irregular-shaped solid obtained by rapid solidification the amorphous form of matter?

Not necessarily, sometimes it is amorphous, sometimes it is polycrystalline, etc., and it looks like there is no regular shape, but the internal particles are arranged in a regular manner.

4. Is the layer of agate on the outside of the crystal ball amorphous?

Be. Now, in some crystal shops, you can see the crystal mine placed there, the inside is the regular crystal, and the shell is amorphous, that is, agate.

5. Through coagulation, solidification and precipitation, can any pure substance obtain its crystals?

Generally, yes. In high school think yes.

6. Does the crystal have the absolute property of "having a fixed shape"?

Yes!!! This is a property that crystals have.

7. Isn't the grain of salt also a crystal (or is it counted as if it is seen through a magnifying glass) And the amorphous without a fixed form also has a regular shape through artificial carving?

The regular shape of the crystal must be naturally formed, not artificially carved. The tiny grains of salt do not seem to have an irregular shape, but as long as there is a large enough magnifying glass, you can still see the orderly arrangement of their microscopic ions, so they are still crystals.

8. Is only covalent bonds directional?

No. Ionic bonds, metallic bonds in chemical bonds are not directional, whereas covalent bonds are directional.

The van der Waals force in the intermolecular force is not directional, but the hydrogen bond is directional.

9. Why is it that metals in the molten state can form crystals no matter how they solidify, but ionic molecules and atomic compounds are not?

Not necessarily. It has now been found that whether it is a metal, or an ion, a molecule, or an atom, it is possible to solidify under special circumstances without forming crystals.

Tell me which crystals are first.

Rosin cheese. Which are amorphous: crystal paraffin aluminum table salt.

The pure substance is definitely crystalline, and the mixture is generally amorphous. The key is to look at the dissolution heat curve to judge.

A crystal is a solid with a definite diffraction pattern, and its atoms or molecules are arranged repeatedly in space according to a certain regular period. The arrangement of atoms or molecules in a crystal has a three-dimensional periodicity that repeats itself at certain distances, and this periodicity is the most basic feature of crystal structure.

The particles (atoms, ions, molecules, and clusters) in the internal structure of the crystal are regularly and repeatedly arranged in three-dimensional space to form a certain form of crystal lattice, which is a geometric polyhedron of a certain shape. The plane that composes a certain geometric polyhedron is called the crystal plane, due to the different growth conditions, the crystal may be a little skewed in shape, but the angle between the crystal planes of the same kind of crystal (crystal plane angle) is certain, which is called the principle of crystal plane angle invariance.

Crystals play a role when crystallized, and their specific functions are as follows:

There are two kinds of crystallization, one is cooling crystallization and the other is evaporation crystallization. Cooling crystallization: first heat the solution, evaporate the solvent into a saturated solution, at this time reduce the temperature of the hot saturated solution, the solubility changes greatly with the temperature of the solute will be crystal precipitation, called cooling crystallization.

Evaporation crystallization: evaporate the solvent to make the solution change from unsaturated to saturated, and continue to evaporate, and the excess solute will be crystal precipitated, which is called evaporation crystallization.

Crystals are substances formed by the regular periodic repetition of the particles (molecules, atoms, ions) of matter in three-dimensional space. It has a wide range of functions, such as transistors in semiconductor radios, and so on.

I'm a practitioner in the filter industry, and I can only ask you part of the problem. First of all, I think the future of the filter industry is very big, especially the active power filter that has just begun to rise in the past two years, the future is very big, and now many companies have invested in this area. Especially in terms of industrial filters, the continuous improvement of the degree of automation will introduce a large number of nonlinear components, which are harmonic sources, and the requirements of automation equipment for harmonics are very high, and they are getting higher and higher, so the demand for filters will be greater and greater.