【 Weak current College 】 capacitor matching skills

In an electrical appliances, particularly in CD, playing an enormous capacitance, because in audio equipment, usage of capacitance is considerable, especially in the middle of the cd, a lot of manifold is necessary and there is little choice, unlike the amplifier's zoom control, you can have many choices, so the CD once manifold fixed, you can select only the capacitance and resistance, resistance to the sound of audio effects than the capacitance of the smaller, the capacitor is our concern. Of course, the role of resistance is relatively small also is relative, for example, input and output resistance on the equipment of the larger, but the other less resistance.
Since the equipment requires a large amount of capacitance, so some problems appeared, so many brands should use? how these capacitors and the mix of equipment made in, the attention of architects, especially for the latter study is even smaller, this is a direct result of domestic equipment while in chip and amplifying tube and foreign equipment almost, but sound obvious low a level. Experiment to see if your CD decoding filter chips for cs4390, cs8412, cs8414, pcm1732, pmd-100, pmd-200, operational amplifier is not lower than opa2604, then your machine after a restart of the match, the sound will have substantial change, you can easily beat the original machine. Here I take the CD as an example to illustrate the capacitor choice and match.
To machine capacity for exquisite match, but you have enough quality capacitors, must also have an important prerequisite, that is, you must have a sufficiently sensitive ears, because in this process, the instrument can provide help with very limited, especially in the film capacitor, a commonly used instrument could hardly play a role, this all depends on your evaluation criteria and ears to the sound of survey. Collocation Fixed capacitors with high capacity capacitor, and then separately on the capacity of small capacitors, at each location might have several brands of capacitance for you to choose, besides the patience of you there is no better choice. When you make each capacitor fix, you must also do a reverse of the work that you added in small capacitor again from small to large order were down, take a look at sound have no change, because our capacitance of regroupment is from multiple locations, this sound modification may overlap, so this last step is essential. If you remove a capacitor, the sound does not change, that means your modified appeared to overlap, you in other parts of the modification has been able to play you removed the role of capacitance, the capacitor can be removed, if you remove this capacitance after sound variation, it shows the capacitance is required, the capacitor will be retained. In addition to remind you that the capacitor installed, use a length of time the sound is a subtle change, as a general rule, at first sounds sound thick capacitance later becomes thinner, sound fine capacitor used for a period of time the sound is thicker, so do not install after simple and listen to the conclusion, or patience to burn through.
Whether designing a device or an addendum is to understand that we are all for the sake of restoring signal, our modified only to the signal does not full restore the means of last resort. Therefore, in an addendum, you must follow this principle, the farther away the final output signal, the more you have to consider the reduction, but the output is close to the place, this time the signal has appeared inevitable distortion and deformation, this time can be considered cosmetic problems.

In a CD requires a combination of local hands-on three blocks, one is a turntable power supply part of the filter capacitors, second-to-analog conversion and subsequent operational amplifier filtering section, the third is the output coupling parts. Which is the final signal output from the first part is, most recently in part III. Therefore part of the turntable, try to pay attention to supply reduction instead of decoration. In the currently available high capacitance, decorated on the sound should be at least of ROE the electrolytic capacitors, so in this link you can consider this capacitance, instead of thinking bi rifa and. We all know the role of capacitance has frequency, different capacity capacitor can enable frequency signals better through, General bulk capacitors are suitable for low frequency adoption, small-capacity capacitor is suitable for high frequency to pass through. Usually a piece of equipment in this often use two, capacitance 3700u useful 4700u, all the signals are directed through these two capacitors, this leads to low-frequency signal smoother, but high frequency signal attenuation occurs, so we want to parallel two small, high-quality film capacitor, for high-frequency signal through the means provided.
In order for each frequency band signal has a dedicated channel, filter capacitors should be different capacitance of the capacitor. For example, select the same manufacturer, same model the same voltage of capacitor parallel connection of different sizes. Specific options for 2200u, 1000u, 680u, 470u, 220u, 100u, less than 100 can consider film capacitor. But now the market is very difficult to find such a complete range of ROE capacitor, it can only do 2200, 1000, and 470 match, note that the use of 1000u two, let each channel capacity reaches around if size 5000u is too small, the machine read disc is not good, will pick up. In order to take care of the high-frequency signal. You must use a number of high-quality film capacitor, it is recommended that you use the ero's film capacitor, 10u, 1u and 0.1u, if you feel the sound too bright, or you can add a capacitance SI Muang, capacity 1-2u, SI bi capacity do not deviate from this capacity is too large. Regardless of whether the magath PI capacitors, the smallest capacity must be the capacitance, the ero on effect of sound field. In this step you can do so many of the complex, just a good sound, the fewer number of capacitance, the better.
Here's to the DAC. No matter what you use, go to this part of the signal has a very large distortion, so at this stage, the modification is necessary. Of course weCosmetic also cannot fail to consider the reduction, therefore this point we can choose filter capacitor can only be rifa. Due to the relatively hard to find RIFA capacitor, so we can use, from largest to smallest way to select the same series of products, while at the same time need you mix some of the film capacitor, in filtering using film capacitor can effectively improve linearity. But the film capacitor for timbre effects also arise, for example, the smell of bile rifa capacitor is very rich, but you use the film capacitor, makes bile flavor, and the film capacitor used for capacity increases, the light flavor of bile, at the same time, the sound levels are getting rich. According to my tests, the film capacitor is much more used to high-pitched after will be affected by a certain influence, not as good as the original was brilliant, but RIFA electro bass sense of texture and light are very good, as you do, you need to press your tastes decides, it is recommended that everyone in 47u can also be used electrolysis, than this small or thin film capacitor is better, you can use 22U, 10U, 4.7Urifa film capacitor can, capacitor market volume is very large, the following is important for capacitance 2u, it is better to use my previous essay on increasing of that rifa aluminium capacitors, sound quality is great, especially when you use the film capacitor allows treble go bad, the more the RIFA capacitor must. 2U under capacitor can use ERO and SI PI matching, high capacity used to think green, smaller with ero, or you can think of PI + green + ero + SI ero way match, gradually reduce capacity, but in the end a minimum capacity of the capacitor with ero, conditions permitting better foil to the last of the capacitor to be a coat. At this level, the total capacity of the capacitor at 4000, size is too big, too heavy, the sound will lack of spirituality.

In addition to the filter capacitor, in this piece also spent a lot of electrolytic capacitors, 16v following 47u following can consider Sanyo solid capacitors, the effect is pretty good, fly in the ointment is the capacitance of the pressure is not high, the capacity is also very small, it is very difficult for 25v100u found other electrolytic try rifa, rifa bridging the digital sound effect is evident in this part as much as possible.
Following the coupling capacitance. General machine for coupling capacitor is relatively obvious, here used in the electrolytic capacitors are often better than other electrolytic capacitors significantly advanced some, but I feel that even advanced electrolytic effect is still not as good as the moment film capacitor of good results. The main difference is the voice of the electrolytic capacitors is quite big impurities relative. Suggested that they all use the film capacitor to match the coupling capacitance. General multiple bit machine is the capacity of the coupling capacitance 4.7u following, single-bit machine, the 100u on the market, the majority of cd is about 100u, you can use the following approach to together, first choose the four 22rifa film capacitor, when you use the capacitance, you immediately feel the intensity of the low-frequency has significantly increased, especially in the low frequency of texture is very good, for instance, we often speak of drum hammer and drum peel of minor sticky, you can listen to it. And the whole sound sound base is clean, fly in the ointment is the variation in the high frequency of ductility. But don't worry, here we start dealing with the treble. We want to use an ero's 4.7u of film capacitor, the high frequency capacitor on this and in doing a restore, and then use our modified repeatedly mentioned rifa 2U of aluminium capacitors, this capacitor on the treble is very important, not only complement the use of 22u film capacitor of treble after loss, but also makes a very bright and brisk treble. This capacitor is best not to use the other varieties, I spent a considerable amount of capacitance do test and found that there is no substitute for this capacitance. Further down on a 1u of SI bi capacitors, this allows the sound become loose and the natural, human-modified marks can also be greatly weakened, while allowing the machine's voice was lovely. In General, this capacitor is not can be used for other manufacturers have to substitute capacitors. In the SI-PI-followed by a capacitance of 0.47u ero, SI BI for appropriate shrink so that high-frequency sound field fixed position more accurate. Put in your every step, then must be followed by a collection of action, this time in an addendum to the very important. In General. The capacitor can complete the match, and if you feel that the treble is not very satisfied with it, can be followed and the previous 0.22u ero capacitors, note the last capacitance remains the ero, and still use copper foil as a reference to it.
The total capacity of the coupling capacitance do not exceed the capacity of existing capacity, the capacity is big sounds dull, slightly lower point better, but also not too low, there is documentation that if you use the film capacitor electrolytic capacitors do coupled substitute capacitors, capacity requires only two thirds of the electrolytic electric capacity, or even lower, I estimate that the listener's filter capacitor placed so much that he had to reduce the amount of the coupling capacitance. If your coupling capacitance, can reduce the filter capacitors, if your filter capacitance big can reduce the amount of the coupling capacitance, between the two, to a certain extent, can complement each other. If you are using to do filtering, rifa filter capacitor capacity much richer in terms of euphony, concentrated bile taste even more, if the coupling capacitance, the bass is powerful and more texture. But finding the best compromise between the two is very, very difficult. According to my test, coupling capacitor or near-original capacity is better, as I described above means coupling Capacitance to fix, and then to adjust the filtering section, because coupling capacitor once used the film capacitor, the sound is very clean so you can more easily adjust filter capacitor.

The capacitors on the article said that the connections are parallel.
Used in this way an addendum, the sound is very beautiful, your machine will add many guiqi! but new problems have come out, it is the space problem. General CD with the thumb of the capacitor however 4700u, 3300 of smaller, and the coupling capacitance 100u only larger than corn, as I said way an addendum, you must add three circuit board that has two grainA Palm-size a circuit board, which set forth requirements for space, it is recommended that you try the nearest two-storey with a way to install new circuit foil packages. If you want to use the machine's idle space installation, your new Board may be from original installation place far from some of the capacitor, it is strongly recommended that you put each Board minimum capacity of the capacitor down nearby the place originally installed capacitors, otherwise it will have an impact on the high-frequency.
Match the capacitor is very time-consuming and money thing, I hope this article can be helpful to you, makes you less wasted a bit of effort and money.