Lead: Quartz crystals (commonly known as crystals) look like a small, inconspicuous device, but in a digital circuit it is like the heart of the entire circuit. All the work of digital circuits can not be separated from the clock, the quality of the crystal oscillator, crystal circuit design is good or bad, will affect the stability of the entire system. Therefore, knowing more about the crystal oscillator and choosing the crystal oscillator used by the system is the first step in determining the success or failure of the digital circuit.
Taking Hundian (Hong Kong) Enterprises Co., Ltd. as an example, in its more than 20 years of working practice, it has encountered various kinds of product usage information feedback from users, among which the crystal oscillator does not start vibration and the crystal oscillator work is unstable. When the vibration is not good, etc. In addition to occasionally oscillating itself, it is a bit tricky. To sum up, there are two kinds of reasons for the poor use of the crystal oscillator: First, the soldering problem. Second, the matching problem of the capacitor.
The main reason for the crystal's deviation from the center frequency of the soldered circuit is that the capacitance of the PCB is mismatched with the crystal. One is that the capacitance value connected to the crystal oscillator may be too large. First, the PCB board has poor consistency and the stray capacitance of the board itself is too large. The following is the calculation formula of the crystal load capacitance, for everyone to refer to when selecting the crystal load capacitance:
CL=(C1*C2)/(C1+C2)+Câ€
Among them CL: The load capacitance value of the crystal; C1 C2: Capacitance value of the two ends of the crystal; C: Line stray capacitance.
The user also needs to pay attention in the welding process. If the solder is immersed, the insulation gasket and the lead and the base are welded together, which destroys the insulation of the crystal oscillator and may cause unstable operation of the crystal oscillator. Only by mastering the details of the production process of the product can we ensure the normal operation of each original on the panel. Only in this way can the products produced have vitality.
Source: Hengyi (Hong Kong) Enterprise Co., Ltd.
Single Cylinder Cone Crusher Parts
High Capacity And Superior Quality. Long Working Life Of Quick-Wear Parts. When the spring cone crusher is working, the motor drives the eccentric bearing bushing via spring coupling, transmission shaft and a couple of cone gear wheel. The crushing cone axis is forced to swing by the eccentric bearing bushing, which makes the mantle sometimes close to the bowl liner, and some times far away from the bowl liner. The raw materials are pressed, impacted and finally crushed in the crushing chamber.
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