offer all kinds of Capacitors informations

Decoupling capacitor

A decoupling capacitor is a capacitor used to decouple one part of an electrical network (circuit) from another. Noise caused by other circuit elements is shunted through the capacitor reducing the effect they have on the rest of the circuit, Above about the Decoupling capacitor information content.

Biased switches

A biased switch is one containing a spring that returns the actuator to a certain position. The "on-off" notation can be modified by placing parentheses around all positions other than the resting position. For example, an (on)-off-(on) switch can be switched on by moving the actuator in either direction away from the centre, but returns to the central off position when the actuator is released, Above about the Biased switches information content.

...

Mercury tilt switch

The mercury switch consists of a drop of mercury inside a glass bulb with 2 contacts. The two contacts pass through the glass, and are connected by the mercury when the bulb is tilted to make the mercury roll on to them, Above about the Mercury tilt switch information content.

...

Knife switch

Knife switches are a more or less obsolete type of power switch used in the 1800s. The live (hot) parts of the switch are uncovered and uninsulated, and they are unsuitable for use at shock-risk voltages. Knife switches have a relatively large contact spacing when open, so in the 1800s were often used to control power machinery running at high voltage, a use that can only be considered dangerous, Above about the Knife switch information content.

Electrolytic Capacitors

"Electrolytic" means any capacitor that requires a conductive layer between the dielectric and one electrode.  In the original electrolytic capacitor, the layer was an actual electrolyte, a conductive salt in a solvent.  Some electrolytic capacitors today don´t actually use an electrolyte, but the word is still commonly used, to the annoyance of some.  Electrolytic capacitors are made by growing a oxide film, the dielectric, on a metal, the anode, by electrochemical means.  The films are very thin with fairly high Ks (roughly 10-25) which make for a lot of capacitance in a small package.  The resulting devices pass current much better in one direction than the other, making a rectifier of a sort.  Because of this, the metals are sometimes called "valve" metals.  The metals presently used are aluminum, tantalum, and niobium, Above about the Electrolytic Capacitors information content.

...

Ceramic Capacitors

Ceramic capacitors offer a broad range of size vs. performance tradeoffs and are easily the most popular in numbers sold.  Ceramic capacitors are available from < 1 pF to 1000s of uF.

Pros: The main virtue of Ceramic capacitors are their relatively high dielectric constants.   This can vary from C0G with a K of up to 60, which has excellent electrical properties but is relatively large and expensive, to ceramics with Ks in the tens of thousands but with very poor electrical properties.  Large- value ceramics can replace electrolytic capacitors in high-frequency applications like switch-mode power supplies because of their lower ESR.  Ceramic capacitors are especially suitable for surface mounting due to their heat resistance, mechanical integrity, and the ability to make them in very small packages at low cost, for portable equipment.  This has greatly added to their usage.  To some extent ceramics are slowly displacing other types of capacitors. 

Cons: Low breakdown voltage means that the low-K ceramics (Class 1), the ones with the good electrical properties, have poor volumetric efficiency, and are usually found only in small values.  High-K ceramics (Class 2 and higher) have poor electrical properties, which are highly dependent on temperature, voltage, and frequency, plus a significant aging rate.  Unlike many other capacitors, ceramics have no self-healing mechanism.  This means that manufacturers must maintain a high level of quality control over the dielectric.  Ceramics are most cost affective in small sizes at present.  Very large ceramics are a bit of a challenge, especially in SMD. 

Film Capacitors

Film includes a variety of polymers, such as polyester, polycarbonate, Teflon, polypropylene, and polystyrene.  Traditional film capacitors were only available in modest sizes, <10 uF.  In recent years, film capacitors have sought to leverage their superior longevity compared to electrolytics, to move into some applications that call for much larger parts, even to thousands of uF.  Film capacitors come in two broad categories, film-foil, and metallized film.  Film-foil capacitors are made of alternating layers of plastic film and metal foil, while metallized film capacitors have the metal vacuum deposited directly on the film.  In general, film-foil is better at handling high current, while metallized film caps are much better at self-healing.  Various hybrid types can also be found, Above about the Film Capacitors information content.

What is a Capacitor?

A capacitor is a energy storing device made up of two parallel conductive plates separated by an insulating (dielectric) material.  When a voltage is applied across the plates, the electric field in the dielectric displaces electric charges, and thus stores energy.  It is assumed that there are no free charges in the dielectric (at least in the ideal case), and that while they are displaced, they are not free to move around as in a conductor.  The closest analogy in the mechanical world is probably energy stored by a spring.  Dielectrics come in two types, "polar" and "nonpolar".  Molecules where the "center-of-gravity" (as it were) of the negative and positive charges are at the same point are nonpolar.  If this isn´t the case, the molecule is polar.  H 2O, for example, is polar, but H2 is nonpolar.

Crystal

In chemistry, mineralogy, and materials science, a crystal is a solid in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial dimensions.

Most metals encountered in everyday life are polycrystals. Crystals are often symmetrically intergrown to form crystal twins.

...

Filter capacitor

Filter capacitors are any capacitors used for filtering. Filter capacitors are common in electrical and electronic work, and cover a number of applications, such as:

Glitch removal on dc power rails
Radio frequency interference (RFI) removal for signal or power lines entering or leaving equipment
Capacitors used after the reservoir capacitor to further smooth dc power supplies
capacitors used in audio, IF or RF frequency filters (eg low pass, high pass, notch, etc)
arc suppression

Filter capacitor RF work

Plate Ceramic Capacitor are usually favoured due to extremely low inductance and low cost. Where precision is needed, silver mica capacitors offer superior precision and stability. Where manual tunability is required, plastic film trimmers are sometimes used, though it has long been more popular to adjust the inductor to achieve tuning.