Capacitors Blog

Suntan Technology Company Limited
---All Kinds of Capacitors

Suntan Technology and Rapid Electronics are delighted to announce a new partnership, which will see Rapid become a franchised distributor for Suntan’s extensive range of potentiometers, capacitors, varistors and diodes.

Rapid is one of the UK’s leading distributors of electronic components, cables and connectors, electrical products, parts and spares for high volume and bespoke industrial customers. Rapid will stock a comprehensive range of our components, with non-stock parts available on short lead times and the complete Suntan portfolio accessible on a high or low volume basis.

Richard Abbot of Rapid Electronics, said: “I am delighted to have signed this agreement with Suntan. We look forward to making Suntan’s high quality ranges available to Rapid customers, and working closely with Suntan over the coming months and years to deliver high service levels and competitive pricing on all Suntan components to our customers”.

For more information about our distributor Rapid Electronics visit www.rapidonline.com

Suntan Technology Company Limited
---All Kinds of Capacitors

In order to promote and elevate reputation, popularity and product knowledge, we plan to customzie our product catalogues / poster for customers. Your company logo and contact information can be put into the catalogs. We can discuss about the quantity and your idea to meet your demand. Now there is an example of bridge Rectifie catalogue.

http://www.suntan.com.hk/about/catalogs.html

http://www.capacitors.hk/catalogs.html

Welcome to send us email for checking. 

Suntan Technology Company Limited
----All Kinds of Capacitors

An electrolytic capacitor is a type of capacitor that uses an electrolyte (an ionic conducting liquid) as one of its plates to achieve a larger capacitance per unit volume than other types, but with performance disadvantages. All capacitors conduct alternating current (AC) and block direct current (DC) and can be used, amongst other applications, to couple circuit blocks allowing AC signals to be transferred while blocking DC power, to store energy, and to filter signals according to their frequency. Although most electrolytic capacitors are polarized; hence, they can only be operated with direct current (DC). The large capacitance of electrolytic capacitors makes them particularly suitable for passing or bypassing low-frequency signals and storing large amounts of energy. They are widely used in power supplies and for decoupling unwanted AC components from DC power connections.
 
Electronic capacitors are one of the most widely used electronic components. These electronic capacitors only allow alternating or changing signals to pass through them, and as a result they find applications in many different areas of electronic circuit design. Suntan supply a wide variety of types of capacitor including electrolytic, ceramic, tantalum, plastic, sliver mica, and many more. Each capacitor type is introduced in www.suntan.com.hk.
 
Two types of electrolytic capacitor are in common use: aluminum and tantalum. Tantalum capacitors have generally better performance, higher price, and are available only in a more restricted range of parameters. Solid polymer dielectric aluminum electrolytic capacitors have better characteristics than wet-electrolyte types—in particular lower and more stable ESR and longer life—at higher prices and more restricted values. 

If you have interested in this hot products and need more information ,Please see our website www.suntan.com.hk. and contact us,Thanks! 

Suntan Technology Company Limited
----All Kinds of Capacitors

Suntan has very good support for Zinc Oxide Varistor, which is widely used in Cellular Telephone, Automotive Electronic Subassembly,
Industrial Power Electronic, Line Voltage Equipment, Lighting Ballasts and other consumer electronics markets.

Voltage: 18V-1800V

Size: TSV05D,TSV07D,TSV10D,TSV14D,TSV20D

Item code: 182K,152K, 112K, 102K, 911K, 821K, 781K, 751K, 681K, 621K, 561K, 511K, 471K, 431K, 391K, 361K, 331K,
                  301K, 271K, 241K, 221K, 201K, 181K, 151K, 121K, 101K, 820K, 680K, 560K, 470K, 390K, 330K, 270K, 220K, 180L

Welcome to try our products. Samples are free for testing.

When used in a direct-current or DC circuit, a capacitor blocks the flow of current through it, but when it is connected to an alternating-current or AC circuit, the current appears to pass straight through it with little or no resistance. If a DC voltage is applied to the capacitors conductive plates, a current flows charging up the plates with electrons giving one plate a positive charge and the other plate an equal and opposite negative charge. This flow of electrons to the plates is known as the Charging Current and continues to flow until the voltage across both plates (and hence the capacitor) is equal to the applied voltage VC At this point the capacitor is said to be fully charged with electrons with the strength of this charging current at its maximum when the plates are fully discharged and slowly reduces in value to zero as the plates charge up to a potential difference equal to the applied supply voltage and this is show below.

More details please check : http://www.suntan.com.hk/

This capacitor is used when a higher tolerance is necessary than polyester capacitors offer. Polypropylene film is used for the dielectric. It is said that there is almost no change of capacitance in these devices if they are used with frequencies of 100KHz or less.

The pictured capacitors have a tolerance of ±1%.

From the left in the photograph
Capacitance: 0.01 µF (printed with 103F)
[the width 7mm, the height 7mm, the thickness 3mm]
Capacitance: 0.022 µF (printed with 223F)
[the width 7mm, the height 10mm, the thickness 4mm]
Capacitance: 0.1 µF (printed with 104F)
[the width 9mm, the height 11mm, the thickness 5mm]

• This is a "Super Capacitor," which is quite a wonder.
• The capacitance is 0.47 F (470,000 µF).
• I have not used this capacitor in an actual circuit.

Care must be taken when using a capacitor with such a large capacitance in power supply circuits, etc. The rectifier in the circuit can be destroyed by a huge rush of current when the capacitor is empty. For a brief moment, the capacitor is more like a short circuit. A protection circuit needs to be set up.

The size is small in spite of capacitance. Physically, the diameter is 21 mm, the height is 11 mm.

Care is necessary, because these devices do have polarity.

Suntan Technology Company Limited
---All kinds of Capacitors

In a way, a capacitor is a little like a battery. Although they work in completely different ways, capacitors and batteries both store electrical energy. If you have read How Batteries Work, then you know that a battery has two terminals. Inside the battery, chemical reactions produce electrons on one terminal and absorb electrons on the other terminal. A capacitor is much simpler than a battery, as it can't produce new electrons -- it only stores them.

In this article, we'll learn exactly what a capacitor is, what it does and how it's used in electronics. We'll also look at the history of the capacitor and how several people helped shape its progress.

Inside the capacitor, the terminals connect to two metal plates separated by a non-conducting substance, or dielectric. You can easily make a capacitor from two pieces of aluminum foil and a piece of paper. It won't be a particularly good capacitor in terms of its storage capacity, but it will work.

In theory, the dielectric can be any non-conductive substance. However, for practical applications, specific materials are used that best suit the capacitor's function. Mica, ceramic, cellulose, porcelain, Mylar, Teflon and even air are some of the non-conductive materials used. The dielectric dictates what kind of capacitor it is and for what it is best suited. Depending on the size and type of dielectric, some capacitors are better for high frequency uses, while some are better for high voltage applications. Capacitors can be manufactured to serve any purpose, from the smallest plastic capacitor in your calculator, to an ultra capacitor that can power a commuter bus. NASA uses glass capacitors to help wake up the space shuttle's circuitry and help deploy space probes. Here are some of the various types of capacitors and how they are used.

• Air - Often used in radio tuning circuits
• Mylar - Most commonly used for timer circuits like clocks, alarms and counters
• Glass - Good for high voltage applications
• Ceramic - Used for high frequency purposes like antennas, X-ray and MRI machines
• Super capacitor - Powers electric and hybrid cars

In the next section, we'll take a closer look at exactly how capacitors work.

Suntan Technology Company Limited
---All kinds of Capacitors

Tantalum bead capacitors are polarised and have low voltage ratings like electrolytic capacitors. They are expensive but very small, so they are used where a large capacitance is needed in a small size.

Modern tantalum bead capacitors are printed with their capacitance, voltage and polarity in full. However older ones use a colour-code system which has two stripes (for the two digits) and a spot of colour for the number of zeros to give the value in µF. The standard colour code is used, but for the spot, grey is used to mean × 0.01 and white means × 0.1 so that values of less than 10µF can be shown. A third colour stripe near the leads shows the voltage (yellow 6.3V, black 10V, green 16V, blue 20V, grey 25V, white 30V, pink 35V). The positive (+) lead is to the right when the spot is facing you: 'when the spot is in sight, the positive is to the right'. 

• For example:   blue, grey, black spot   means 68µF
• For example:   blue, grey, white spot   means 6.8µF
• For example:   blue, grey, grey spot   means 0.68µF

Suntan Technology Company Limited
---All kinds of Capacitors

In many ways capacitors are the hidden saving grace of the electronics world. They play an essential role in smoothing switch transitions by storing and releasing a small amount of energy over short time scales. Although inductors can play the same role, I think it is safe to say that without small, accurately valued capacitors the modern electronics industry would be a very different beast. Essentially, capacitors store charge, which means that the amount of charge they can store is related to the area available to put said charges. Over recent years, the development of better control over small scale structuring has lead to large increases in capacitance in relatively small packages. The increases have been such that there have been some thoughts of putting these supercapacitors to work as battery replacements in applications where high currents are required.

On that front we can present some good news. Last month Science reported that scientists had observed an unexpectedly large increase in capacitance in some nanoporous materials. A capacitor at its most simple is a couple of parallel metal plates, where the capacitance increases with the size of the plates and as the two plates get closer together. Unfortunately, increasing the area without too much thought is a quick way to find yourself ordering another 19 inch rack for your capacitors, while sparks, ashes, and electrical fires come from the plates getting too close together. However, an alternative is to roughen the surface and include an electrolyte, which effectively replaces the second plate. This increases the surface area of the plates without increasing the volume. The development of nanoporous materials has lead to dramatic increases in the surface area of capacitors and hence a reasonably sized supercapacitor. Exploring nanoporous carbon for capacitance is nothing new, however, previous methods had very little control over the pore size. Here the researchers developed a different fabrication process that allows them to control the pore size to within 0.05nm. The process begins with a carbide substrate, which is a metal plus carbon atoms. They then etch the metal away by reacting it with chlorine, leaving the surrounding carbon structure intact. Since the amount of metal in a carbide depends on the which metal is used, the pore size can be controlled quite accurately by a good choice of metal and the amount of etching performed.

Once the pore size reduced to that below the electrolyte ion plus surrounding solvent molecules , the effect of the pores was reduced. This is because the increased surface area only works if the distance between the electrolyte and plate remains constant and once the pores get too small the charges on the inside of the pore are too far from the nearest electrolyte ion. However, a further decrease in pore size saw the capacitance increase again. It turns out that when the material is so porous, many of the carbon atoms are just barely hanging on. As a result they can move around quite a bit, which allows the electrolyte to squeeze in. The resulting tight fit between the two means that along with an effective increase in surface area, the gap between the two plates is also decreased. Both of these factors increase the capacitance.

I would say the future looked foamy but my glass is empty.