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ResistorGuide.com
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Resistor, Electronics, Education, Resistor color code, Varistor, Potentiometer, Wirewound
Resistor, Electronics, Education, Resistor color code, Varistor, Potentiometer, Wirewound

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The ResistorGuide is the most complete online reference about resistors. No we're building CapacitorGuide.com, which will be a complete overview about capacitors. The project is still in progress, but you'll find already more than a dozen articles.

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Pull-up and pull-down resistors are often used when interfacing a switch or some other input with a microcontroller or other digital gates. In the article you can read how they exactly work and what are the most typical applications.

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Variable resistors consist of a resistance track with connections at both ends and a wiper which moves along the track as you turn the spindle. The track may be made from carbon, cermet (ceramic and metal mixture) or a coil of wire (for low resistances). The track is usually rotary but straight track versions, usually called sliders, are also available. After being set to the appropriate location, the wiper's position often remains fixed on the circuit board; however, it can also be made user adjustable with a screwdriver.

http://www.resistorguide.com/potentiometer/

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Fixed value resistors have a defined ohmic resistance and are not adjustable. This resistance should be independent of for example frequency, voltage or temperature. In practice no resistor is perfect and all resistors have a certain stray capacitance and inductance, resulting in an impedance value different from the nominal resistance value. The resistor materials have a certain temperature coefficient, resulting in a temperature dependency of the resistor value. Fixed resistors are the most commonly used resistors and in general one of the most used electronic components.

http://www.resistorguide.com/fixed-resistor/

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Nowadays the most used resistors are surface mount or SMD resistors. SMD stands for Surface Mounted Device. An SMD is any electronic component that is made to use with SMT, or Surface Mount Technology. SMT was developed to meet the ongoing desire for printed circuit board manufacture to use smaller components and be faster, more efficient, and cheaper. Nowadays most of the circuit manufacturers tend to use SMD resistors. Resistance values of the SMD resistors are indicated by using a code.

You can easily get resistance values of the SMD resistor using our SMD resistor calculator available at http://www.resistorguide.com/resistor-smd-code/

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In this instruction is explained how to calculate the equivalent resistance for resistors that are connected in series or parallel. Also an example is given of how to solve a resistor network where resistors are connected both in series and parallel.

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Wirewound resistor are amongst the most common resistor types. They are constructed by winding a resistive metal wire, such as Nichrome, around a non-conducting core. They can have very low resistance values and very high power ratings. Wirewound resistors are also available as high precision resistors. As a result of the construction, wire wound resistors have some capacitance and inductance. With high frequencies this becomes a problem. The effect is sometimes reduced by alternative winding methods.
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Varistors are resistors that have a resistance value dependent on the voltage. They are also called VDR (Voltage Dependent Resistor). If the voltage over the varistor increases excessively, the resistance drops strongly. For this reasons, varistors are often applied als circuit protectors during voltage surges. This can for example be during an electrostatic discharge or a lightning strike. The most popular varistor is the MOV (Metal Oxide Varistor).

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SMD (Surface Mount Device) resistors often have a printed code to indicate the resistance value. In this instruction the two most popular coding systems are explained: the 3&4 digit system and the EIA-96 system.
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