Trusted Name In Electronics Components

Beiträge vom December, 2010

Chip resistor

Thursday, 30. December 2010 3:38

A chip resistor is a very compact,surface mounted electronic component designed to offer a known resistance to any electrical current flowing through it.A mini resistor of this kind are designed to have the same physical characteristics or form factor as other surface mount devices (SMD) to conform to SMD circuit board geometry.It differs from conventional axial lead resistors in physical form only and fulfill the same functions in electronic circuits. Chip resistors are available in several package formats and with a range of specialist features.A typical chip resistor may include a small, rectangular supporting substrate on which a resistor layer having a required resistance is formed together with two terminal electrodes connected to the resistor layer.For protection of the resistor layer, a protective coating is formed on the substrate to cover the resistor layer.Chip resistors are generally produced by forming a resistive layer on the surface of an insulating substrate,providing electrodes at both ends of the resistive layer, and forming one or more protective films on the surface of the resistive layer.


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Aluminum Electrolytic Capacitor

Tuesday, 28. December 2010 10:11

Elecsound can offer various kinds of capacitors,tantalum capacitor,ceramic capacitor,film capacitor,etc.Aluminum Electrolytic Capacitor is suitable for small temperature changes,the operating frequency is not high (no higher than 25kHz) of occasions,can be used for low-frequency filter (high frequency electrolytic capacitors in parallel have the time filtering lower-frequency difference),aluminum electrolytic capacitor has polarity,install must ensure that the correct polarity,otherwise the risk of explosion.

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zinc oxide varistor

Monday, 27. December 2010 8:55

Varistors are non-linear, voltage-dependent resistors whose value of resistance decreases with increasing voltage.Varistors have high resistance and are good resistors when loaded with voltage below the critical voltage.The resistance of the varistor abruptly decreases and the electric current through the varistor will greatly increase when voltages are higher than the critical voltage.Varistors possess the ability to absorb surges,reduce overload voltage to a safe level and prevent electric components from being damaged by surges.Varistors are utilized in low-voltage electronic equipment for absorbing high-voltage pulsative noise while bypass capacitors are utilized for removing low-voltage and high-frequency alternating noise.Zinc oxide varistors are polycrystaline ceramic semiconductor devices based on zinc oxide.They have highly non-linear current/voltage characteristics, similar to back-to-back Zener diodes,but with much greater current and energy handling capabilities. Zinc oxide varistors are and widely applied to home appliances,factory devices,power transmission lines and other many kinds of instruments having electrical circuits,to protect them from damages to power surges by taking advantage of the nonlinearity between current and voltage of a varistor.

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SMD resistor

Thursday, 23. December 2010 5:46

SMD resistor is one kind of resistors which is rectangular in shape.They have metallised areas at either end of the body of the SMD resistor and this enables them to make contact with the printed circuit board through the solder.The resistor itself consists of a ceramic substrate and onto this is deposited a metal oxide film.The thickness,and the length of the actual film determines the resistance.As SMD resistors are manufactured using metal oxide,so they are quite stable and usually have a good tolerance.SMD resistors are suitable for compact circuit boards,and for automatic assembly techniques,but it also ahs the advantage that they perform well at radio frequencies.

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printed circuit boards

Wednesday, 22. December 2010 9:37

PCB is used to mechanically support and electrically connect electronic components using conductive pathways,tracks or signal traces etched from copper sheets laminated onto a non-conductive substrate.PCBs are inexpensive, and can be highly reliable. They require much more layout effort and higher initial cost than either wire wrap or point-to-point construction,but are much cheaper and faster for high-volume production.There are many different types of Printed Circuit Board materials in the market these days,such as FR-1, FR-2, CEM-1, CEM-3 and FR-4.The thickness of the PCB can be 1.0mm,1.2mm or 1.6mm.They can be single sided or double sided with cooper clad of 1 oz or 2 oz.We specialize in single-side PCB, double-side PCB, 4 layers PCB to 8 layers PCB.

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Toggle switches

Tuesday, 21. December 2010 5:59

Electronic switch can be visualized as a group of one or more mechanical electrical switches in which,instead of mechanically opening or closing the contacts, the physical opening and closing is achieved by applying appropriate electrical control signals to separate terminals on the switch in much the same way that a relay performs.A toggle switch is a class of electrical switches that are actuated by a mechanical lever, handle,or rocking mechanism.It is a switch that uses a toggle joint with a spring to open or close an electric circuit as an attached lever is pushed through a small arc.Toggle switches are available in many different styles and sizes,and are used in countless applications.Many are designed to provide,e.g.,the simultaneous actuation of multiple sets of electrical contacts,or the control of large amounts of electric current or mains voltages.

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Monday, 20. December 2010 5:58

Transistors can be regarded as a type of switch, as can many electronic components. They are used in a variety of circuits and you will find that it is rare that a circuit built in a school Technology Department does not contain at least one transistor. They are central to electronics and there are two main types; NPN and PNP.It is made of a solid piece of semiconductor material, with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor’s terminals changes the current flowing through another pair of terminals. Because the controlled (output) power can be much more than the controllin (input) power, the transistor provides amplification of a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.The transistor is the fundamental building block of modern electronic devices, and is ubiquitous in modern electronic systems.

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Friday, 17. December 2010 5:45

Fuse is a type of sacrificial overcurrent protection device. Its essential component is a metal wire or strip that melts when too much current flows, which interrupts the circuit in which it is connected. Short circuit, overload or device failure is often the reason for excessive current.Fuses are used to conduct current under normal conditions and to break a circuit under overload conditions by the melting of fusible elements of the fuses. Typically, a fuse consists of a fusible link installed in a circuit.Typically, fuses or fusible links are incorporated in the design of the integrated circuit, wherein the fuses are selectively blown,Fuses are commonly used in automotive electrical systems to protect circuits against potential damage caused by overload conditions

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Thursday, 16. December 2010 5:55

There are two classes of resistors; fixed resistors and the variable resistors. They are also classified according to the material from which they are made. The typical resistor is made of either carbon film or metal film. There are other types as well, but these are the most common.Carbon film resistor is the most general purpose, cheap resistor. Usually the tolerance of the resistance value is ±5%. Power ratings of 1/8W, 1/4W and 1/2W are frequently used.Metal film resistors are used when a higher tolerance (more accurate value) is needed. They are much more accurate in value than carbon film resistors. They have about ±0.05% tolerance. They have about ±0.05 tolerance. The metal film resistor is used for bridge circuits, filter circuits, and low-noise analog signal circuits.

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Wednesday, 15. December 2010 9:17

A semiconductor is a material with electrical conductivity due to electron flow (as opposed to ionic conductivity) intermediate in magnitude between that of a conductor and an insulator. This means a conductivity roughly in the range of 103 to 10−8 siemens per centimeter. Semiconductor materials are the foundation of modern electronics, including radio, computers, telephones, and many other devices. Such devices include transistors, solar cells, many kinds of diodes including the light-emitting diode, the silicon controlled rectifier, and digital and analog integrated circuits. Similarly, semiconductor solar photovoltaic panels directly convert light energy into electrical energy. In a metallic conductor, current is carried by the flow of electrons. In semiconductors, current is often schematized as being carried either by the flow of electrons or by the flow of positively charged “holes” in the electron structure of the material. Actually, however, in both cases only electron movements are involved.Highly refined materials made of silicon and other elements, semiconductors can carry small electric currents.


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