Different frequencies of crystal oscillator can be replaced by flexibility, high frequency instead of low-frequency, need to connect a capacitor, low-frequency replacement, high frequency needs, and a capacitor. The specifications of this capacitor are calculated. Nominal frequency of the same crystal, the load capacitance is not necessarily the same. The quartz crystal oscillator has two resonant frequencies, one is a low load capacitance oscillator with series oscillating oscillators, and the other is a high load capacitance oscillator with a parallel vibrating crystal oscillator. So, the same nominal frequency oscillator when the interchange is required to load capacitance, not to swap, otherwise it will cause the appliance does not work properly.
Usually in the replacement of crystal oscillator, we should use the same model products, or the same size and parameters are consistent products, quartz crystal oscillator has many types of crystal oscillator can replace each other. SMD crystal oscillator, its performance, the price and the pin, coating, nominal frequency and so on. Substitution of high precision crystal oscillator frequency with the original crystal, even the suffix letters are to make the circuit work because as like as two peas, in order to avoid. If the frequency is the same; and a considerable portion of the circuit of the crystal is very strict, these circuits require not only the new and original crystal oscillator frequency should be consistent, even the suffix letter to (crystal is as like as two peas series and parallel points), otherwise it will not work properly, so we to leave your heart in the replacement of crystals, try to use the same substitution to new fault crystal.
If the frequency of the crystal is different, the phenomenon of stopping vibration is likely to occur! Clock is inside the watch crystal, fast and slow, and the frequency point of the crystal deviation. The replacement of crystals will use the same good product, because there is a considerable part of the oscillator circuit requirements are very strict, these circuits require not only the new and original crystal oscillator frequency to maintain consistency, even suffix letter to you cannot work as like as two peas. Therefore, when a new crystal oscillator is used to replace the damaged old crystal in the circuit board, the crystal is damaged by vibration and moisture, and the frequency shift or the loss is increased. The suspected SMD crystal oscillator can be used to accurately detect its Q value factor, central frequency point and other parameters, need to see in addition to packaging, frequency, but also a lot of details to do.
Crystal, is the most important component in the clock circuit, its role is to provide a reference frequency to each part of graphics card, motherboard and other accessories, it is like a scale, frequency instability will cause the equipment working frequency is not stable, naturally prone to problems. Due to the manufacturing process continuously improve, now the oscillator frequency deviation, temperature stability, aging rate, sealing of important technical indicators are very good, is not prone to failure, but still pay attention to the quality of the crystal in the selection.
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