Crystal

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The notion of crystal, graphical characters, classification
crystal circles momentous in the native MP3 is one of the crystal if the break, MP3 will not shoe, tin not start. So what is crystal,Minnetonka shoes, crystal in MP3 character in what the crystal out what happens later a failure, how to mend it?
generally called crystal crystal resonator is a mechanical and electrical devices, electricity expense is by small quartz crystal precision tearing grinding and welding on wrapped wire electrode made of, the cardinal frequency reference for the circuit to provide meta- appliance. The crystal has a very important trait, and if his power, he will generate mechanical oscillations, on the contrary, if the mechanical compel to him, he will produce electricity, a function called the mechanical and electrical effects. They have a very important function, the oscillation frequency and their shape, materials, and so closely narrated to the mowing direction. Chemical properties of the quartz crystal is very stable, very small thermal expansion coefficient, the oscillation frequency is very stable, because the control can be very precise geometry, and accordingly its resonance frequency is very exact. Quartz crystal oscillator frequency permanence up to 10 ^ -9 / daytime, or 10 ^ -11. For example 10MHz oscillator,Men's Minnetonka Driving Shoes, the frequency alterations among one day does not surpass 0.1Hz. Therefore, the crystal oscillator can be regarded as a constant reference frequency source (quartz form, electronic form is done using quartz crystal timing reference frequency.)


crystal oscillator circuit using Usually divided into spirited and passive crystal oscillator two categories, passive crystal oscillator inside the chip necessary,Minnetonka Boots, and since the crystal oscillator circuit marker voltage may be based on granting alter voltages, but the passive crystal signal quality and accuracy is often poor, requiring a precise mate the external circuit (inductors, capacitors, resistors, etc.), for replacement of a crystal to also replace the external circuit. Active do not absence the chip's internal crystal oscillator, can provide high-precision frequency reference, the signal quality is better than the passive crystal.
deserving to price and other factors, the substantial petition in the use of mostly passive crystal circuit design, circuit design, unless the timing is exceedingly sensitive or non-chip oscillator (such as some models of the DSP, or accuracy instruments.)
crystal passive studying board,Women's Minnetonka Ankle, the emulating is to study the crystal panel schematic.

learning board schematic

XAL1 crystal is a passive crystal feet,Moccasins Shoes, 11.0592MHZ oscillation frequency, matching the ceramic capacitor namely the capacitance of the 2 30P.
handbook on each piece will provide a criterion outer crystal input circuit, the piece will show that the maximum frequency and other parameters can be used in the design circuit to main. Different computer with CPU, MCU can immediately receive the crystal frequency is relatively cheap, but ample for the common control circuit.
too point out, there may be some beginners will often detect it curious crystal, 12M, 24M crystal like a better understanding of the crystal accustom as 11.0592MHZ gives a strange feeling, apt annotate the problem up extra difficulty, if the reg code programming as newcomers, while in train this will be knew that this crystal is mainly designed because effortless and accurate, alternatively additional asynchronous reg code communication baud rate.
crystal often used in the MPN circuits: clock oscillator (MP3), real-time crystal (MP4), amplifier crystal, FM crystal, MPN general crystal are: 6M, 12M, 24M, 24.576M, 27M and so ashore.
the crystal frequency in the MPN in general are tall, the ambient temperature is relatively high, and often call for USB hot plug, so the relatively high failure rate of the crystal, usually a crystal to be used in the replacement the same type of new productions, for a considerable part of the requirements of the crystal circuit is very claiming, these circuits not only necessitate new and the original crystal oscillator frequency to the same suffix letter ought be accurate the same even (the crystal is a string the collateral of the points), otherwise it does not work, so when everyone in the replacement of the crystal to reside about the center,Women's Minnetonka Moccasin, using exactly the same as new to substitution failures crystal.