The led is dwupinowym electronic element that conducts current primarily in one direction (pointing asymmetrical); it has low (ideally zero) resistance in one direction and high (ideally infinite) resistance in the other. Currently, the most commonly used semiconductor devices - silicon diodes złączowe, but the history of these items goes back electron tubes. The led is the simplest of the active element and nonlinear, which is used in electronics. Each elektronik should carefully review with its principle of action, as well as their individual views, to be able to easily use them in your own custom developed devices. LEDs are the major elements of many projects, electronic, and electronics each workshop will have at least one led.


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A diode is the simplest semiconductor device

The main function of this indicator is current rectification - of the passage in only one direction, called direction of conductivity) while simultaneously blocking it in the opposite direction (polarity gate). However, the diodes can have more complicated behavior than just the management of the flow of current due to their nonlinear current-voltage (I/V). Semiconductor diodes begin to conduct electrical current only when is reached the voltage thresholds in the direction of conduction. The voltage drop across the diode varies depending on temperature; this effect can be used for its measurement.

Different types of diodes

Characteristics And/V LEDs can be changed by selecting the appropriate materials. These methods are used to create LEDs for special purposes, for example, voltage regulation (Zener diodes), to protect circuits from voltage surges (avalanche diodes preparation and Schottkiego), for electronic tuning of radios and televisions (warikapy and waraktory), to generate RF oscillations (tunnel diode, Gunn diode) for the production of light (LEDs). LEDs as vacuum and semiconductor, can be used as noise generators śrutowych.

The history of LEDs

LEDs termoelektronowe (vacuum or Coca-Cola) and solid state diodes were developed separately, but around the same time, in the early twentieth century, first as detectors for radio receivers. Till the 50-ies of XX century vacuum diodes were often used as early cutting edge of led semiconductor was unstable. In addition, most of the sets boxes were already other lamps vacuum to strengthen, so that the LEDs can be easily integrated in these elements. Rectifiers lampowe - vacuum and gas - was able to handle higher currents and voltages better than semiconductor diodes (for example, rectifiers selenowe) that were available at the time. Only in the 50s of the twentieth century was developed LEDs złączowe - using semiconductor connector PN - which gradually began to replace the device lampowe.

The principle of operation of connector PN

Connector PN occurs at the junction between the two materials on a semiconductor domieszkowaniu type P and N. the P Side includes an excess of holes and N-electrons. This allows the flow of electric current through the connector in only one direction with application of an external electric field - stress - for the semiconductor device. Connector PN arises from the admixture of the layers, e.g. by ion implantation, impurity diffusion or epitaksję.

Types of diodes

In our store presents a wide range of semiconductor diodes, designed for repeated use. In addition to the usual devices for current rectifying, we offer items such as LEDs Schottkiego if the Zener diodes, featuring an unusual shape of the curve And/V and light-emitting diodes, which under the action of electric current emits light. Each of these semiconductor devices is intended for another use. Thanks czytelnemu the categories in the store Botland, you can easily find desired item.