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Cadaco Foto-Electric Hall of Fame FB Game(1971) $35.71

1970 Cadaco Foto-Electric Football Hall Of Fame Game. working. faded box $9.99

BOXED 1956.FOTO ELECTRIC FOOTBALL.CADACO.12 OFFENSIVE + 6 DEFENSIVE PLAYS. NICE $22.98

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Vintage 1965 Cadaco Foto-Electric Football w/ Box $9.99

Vintage 1970 Cadaco Foto-Electric Football Game Piece A and B Spinners $3.99

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1971 FOTO-ELECTRIC FOOTBALL By Cadaco (with Sealed Plays) $35.00

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Vtg 1954 Foto Electric Football Sports Board Game Cadaco Ellis Works Complete $24.99

1965 FOTO-ELECTRIC-FOOTBALL Nation Pro HALL of FAME GAME Cadaco Vintage TESTED $39.95

Vintage Cadaco Foto-Electric Football Hall of Fame Game $69.99

Vintage 1970 Cadaco Ellis Foto-Electric Football Game NFL Hall of Fame COMPLETE $19.99

Cadaco FOTO-ELECTRIC FOOTBALL Game 1965 Edition w/ HOF tickets + newsletter NFL $59.99

1970 National Pro Football Hall of Fame Game Foto – Electric Football Cadaco 230 $30.00

Cadaco Foto-Electric Football Game 1965,COMPLETE with all parts,light works, EVC $123.15

1941 Foto-Electric Football Game $80.00

FOTO-ELECTRIC FOOTBALL GAME Vintage 1953 Cadaco-Ellis $54.00

VINTAGE 1965 CADCO FOTO-ELECTRIC FOOTBALL NATIONAL PRO FOOTBALL HALL FAME GAME $79.99

Vintage 1950′s FOTO-ELECTRIC Football Game Excellent Condition! Board Game $49.95

FOTO ELECTRIC FOOTBALL NATIONAL PRO FOOTBALL HALL OF FAME GAME CADACO 1970 VINTA $39.99

Vintage Foto Electric Football Game by Cadaco Ellis Toys, Excellent Condition! $69.99

Vintage 1955 Foto-Electric Football Game By Cadaco Ellis Toys $37.49

Vintage 1956 Cadeco Ellis Foto Electric Football game in box $19.99

Great Vintage FOTO ELECTRIC FOOTBALL Game $29.59

Light Emitting Diode, Diode or Light Emitter

Property

LED is a semiconductor diode (PN junction) when activated emits visible light for the LED (Light Emitting Diode).

The light is not monochromatic (as in a laser), but a spectrum band is relatively narrow, which is produced by the energy of electrão interacções. The light emission process for the implementation of a source of electrical power eletroluminescência is called. In any forward-biased pn junction in the interior of the structure, near the junction of recombination occurring in the gaps and electro. This requires that recombination energy that has to electrão, which until then was free, to be released, which occurs as heat or light photons.

In the silicon and germanium, which you / they are the basic elements of the diodes and transistors, among other electronic components, most energy is released as heat being emitted negligible (due to the opacity of matter) light, and the components that operate at higher current capability comes the need for irradiators heat (dissipadores) to assist in maintaining the temperature at a tolerable landing.

Or in other materials such as gallium (GaAs) or Gallium arseneto (GaP) fosfeto, fotões the number of light emitted is enough to establish highly efficient light sources.

The simplified form of a PN junction of an LED shows its eletroluminescência process. The dopant material of a semiconductor area contains atoms with one fewer electron in the valence band in relation to semiconductor materials. In the connection, the ions of the dopant material ("beneficiary" ions) to remove the valence electrons of the semiconductor, leaving "holes" by Therefore (or holes), becomes p-type semiconductor In another area of the semiconductor, the dopant material contains atoms with one electron more than the semiconductor pure in her / strip valence. Therefore, the connection that is available on the electrons as free electrons, forming the n-type semiconductor

Semiconductors can also be the kind of compensation, ie possessing both dopants (P and N). In this case, the higher concentration of dopant determine what type is the semiconductor. For example, there are more doping than it would take N-type P, the P-type semiconductor This implies, however, the reducing the mobility of carriers.

The mobility of carriers is the ease with which N and P load (electrons and holes) flow through the crystal structure of material without colliding with the vibration of the structure. As greater mobility of carriers, the lower the loss of energy, therefore the lower the resistividade.

In the area of contact areas, the electrons and holes if recombinam, creating a thin layer practically free of charge carriers, the so-called barrier potential, where the ions have only "donors" of the N and the beneficiary "of the P ions, which, to submit the charge carriers do not" isolate " the other gaps in the P material from other material free electrons N.

A free electron or a deficit can only cross the potential barrier by the application external bias (direct binding) energy. Here it is necessary to emphasize a physical fact of semiconductors: in these materials, electrons can only take certain energy levels (discrete levels), with the valence bands and the transport of the largest energy levels for electrons occupy.

The area between the top of the valence and bottom of the transport is what is called "band gap". If the semiconductor material is pure, he / she does not have electrons in the band (later to be called "Forbidden"). Recombination between electrons and the gaps, which occurs after winning the potential barrier, which can happen in the valence band or the forbidden. The possibility that recombination happens in the band gap, if it is due to creation of electronic states of energy in that area for the introduction of other sludges in the material.

As recombination occurs more easily nearest level energy of the conveyor belt, you can choose properly the sludge for the manufacture of LEDs, so that their exposure / the bands appropriate for the issuance Wanted color (wavelength specific) light.

Operation

The emitted light is not monochromatic, but is the relatively narrow band of color. The color, therefore, depends on the crystal and impurity dopagem with which the component is constructed.

The LED that uses the Gallium arseneto infrared radiation. Taking drugs with a match, the issue may be red or yellow, according to the concentration. Gallium be used dopagem fosfeto of nitrogen, emitted light can be green or yellow.

Today, with the use of other materials, is achieved for the production of LEDs that emit blue light, and even ultra violet purple.

There are also white LEDs, but these are generally the issue of blue LEDs, covered with a layer of game same type used in fluorescent lamps, which absorbs blue light and emits white light.

With the price barateamento, high income and high durability, LEDs to become a great replacement for common bulbs, and replace the medium and long term.

There are also so-called RGB white LED (more expensive) and are composed of three chips, one red (red R), green (green G) and blue (blue B). A variation of the leds are RGB LEDs with an integrated microcontroller, This allows you get a real light show just by using a LED.

He / she is the physical aspect of some leds and its electrical symbol.

In general, the LEDs are powered by the voltage level of 1.6 to 3.3 V, being compatible with solid state circuits. Interestingly, stress depends on the wavelength emitted.

Thus, the infrared LEDs are working with less than 1.5 V, 1.7 V reds, yellows with 1.7 V or 2.0 V, the green between 2.0V and 3.0V, while the blue LED, violet and ultraviolet light, usually need more than 3V.

The power required is typically in the range of 10 150 mW, with a lifespan of 100,000 hours or more.

As directed a PN junction device, the polarization characteristics Direct is similar to that of a semiconductor diode.

When polarized, most manufacturers adopted an identification code for "" express determination of the terminals, the anode () and the cathode K () of the LEDs.

In the round of LEDs, two codes are common: he / she identifies K terminal as being so close to a small corner on the side of the circular base of involucre ("body"), or being the smaller of the two terminals. Manufacturers adopting the two forms of identification while there.

In the rectangular leds, some branded manufacturers terminal K with a small "extension" terminal near the base of the component, or then let the shorter terminal.

But, you can pass the component does not bring any external reference ID terminals. In that case, if the involucre semi-transparent, you can identify the cathode (K) as the terminal that contains the expanded inner electrode of the electrode other terminal (anode). Also wider, sometimes the cathode is less than the anode.

The light-emitting diodes are also used in the construction of alphanumeric displays.

There are also two-color LEDs, which are composed of two joints of different materials in a casing for it, so that an investment polarization changes in the color of the light emitted from green to red, and vice versa.

There are still three terminals bicolor LEDs, one for work union doped material to produce green light, one for union work doped material to generate the red light, and the third common to the two unions.

The common terminal may correspond to the anodes interligação unions (common anode leds bicolor) or its cathode (the cathode bicolour leds common.)

Although usually treated by two-color (green vermelho +), run, leading the type is in fact a "tricolor" as well as two separate colors, each generated at a junction, the two unions be polarized simultaneously, resulting in the emission of light orange.

In general, the LEDs are used in place of signal lamps or lights of the pilots' instrument panels and clothing number. For fixing of the panels, are commonly used plastic media thread.

As the LED, can not directly receive the voltage across terminals once the current must be limited so that the connection is not damaged. Thus, the use of a limiter with LED series resistance is common in the circuits that you use him / her.

To calculate the resistance value of the following formula used: R = (Vfonte-VLED) / ILED, which is Vfonte the available voltage, voltage VLED is correct for the LED in the field and is the current ILED can safely withstand.

In general, large (approximately 5 mm in diameter, when and from) work order LEDs with currents 12-30 mA and the small (about 3 mm in diameter) operating with half of that value.

Thus:

We have adopted I1 and I2 = 15 mA = 8 MA, Vfonte = 12 V, VLED = 2 V:

R1 = (12-2) / 0015 = 10 / 0015 = 680 *

R2 = (12-2) / 0008 = 10 / 0008 = 1K2 *

We approached the results for the commercial values.

LEDs do not support reverse (Vr) voltage of significant value, may deteriorate with 5V only tension in this regard.

Therefore, when fed by the voltage C.., Accompanying LED a rectifier diodes in antiparallel (reversed polarity in relation to LED), for the purpose of conducting the semi-cycles we he – LED – is cut off, which limited to reverse the tension around 0.7 V (maximum forward voltage diode), a value low enough that their union does not deteriorate.

You can also take a serial connection between the LED and protection diode.

About the Author

Carla Sofia adores technology especially the technology LCD.Televisores LCD and see the Televisor Samsung LCD TV de 32 polegadas

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