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Today there is a wide range of CD players available for the consumer and choosing the right CD player can feel like an arduous task. Style, quality, design och technical solutions vary greatly between the different players. Some players are portable; others are included in larger sound systems. Some players can only handle one disc at the time; others can easily skip between 50 discs or more. Some CD players are very cheap, others are highly expensive. The list goes on and on. Regardless of which CD player you choose it will however consist of three basic parts that are found in all moderns CD players: a drive motor, a tracking device and a laser and lens system. Another thing that all CD players have in common is that they interpret data that has been stored in the form of elongated bumps on a CD (compact disc).
The drive motor in your CD player is the part that makes the disc spin round and round at a correct pace. The drive motor will gradually adjust the speed, since the correct pace depends on which part of the disc that is currently being interpreted. At some spots, the pace will be no higher than 200 rpm, while at other spots the pace needs to be increased up to 500 rpm. As the disc is rotated round and round by the drive motor, the tracking mechanism will adjust the laser assembly and make it possible for the laser and lens system to focus on the miniscule bumps where data has been stored. The laser is constantly being pushed from the centre and outward over the disc by the tracking mechanism.
The data interpreted by the laser and lens system has been stored in the form of elongated bumps on the surface of the CD. One single bump is very small and no wider than 0.5 microns. The height is greater than 125 nanometres and the length is 0.83 microns or slightly more. All these bumps are very neatly organised at the surface of the CD in the form of a 5 kilometre (3.5 miles) long spiral.
The CD itself is made up by several different layers, including a polycarbonate layer and an aluminium layer. When the laser tries to interpret data that has been stored on the CD, it will first penetrate the polycarbonate layer. The aluminium layer will then reflect the laser beam, and the light alterations will be detected by a special optoelectronic mechanism in the CD player. Since the bumps in which data has been stored reflects light in a different way compared to the areas between the bumps (commonly referred to as "lands"), the CD player can determine exactly which parts of the disc that is made up by bumps and which parts that are not.
If a CD is scratched or injured in any other way, it can be impossible for the CD player to interpret it. Sometimes only a minor part of the data will be skipped, but larger damages can render the entire CD useless. Always store your CD's in a protective casing to decrease the risk of scratches. When you clean your CD's, carefully move your hand from the centre and outwards to the edge rather than just swabbing around. Scratches that occur from a radial movement tend to be less damaging than other scratches.
The information you just read about CD players can be applied to most types of optic drives and can not only help you pick out a CD player for you home but also other types of optic drives such as car CD players and car DVD players [http://www.cardvdplayers.info].
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Scosche / IPAD SNAPSHIELD POLYCARB / IPDBL $27.93 Scosche - IPAD SNAPSHIELD POLYCARB - IPDBL |
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Scosche / IPAD SNAPSHIELD POLYCARB / IPDPU $27.93 Scosche - IPAD SNAPSHIELD POLYCARB - IPDPU |
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Scosche / IPAD SNAPSHIELD POLYCARB / IPDC $27.93 Scosche - IPAD SNAPSHIELD POLYCARB - IPDC |
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Scosche / IPAD SNAPSHIELD POLYCARB / IPDP $27.93 Scosche - IPAD SNAPSHIELD POLYCARB - IPDP |
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Stenographer Uses Polycarb Carbon Paper $34.99 Stenographer Uses "Polycarb" Carbon Paper - Giclee Print |
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BillyOh Wooden Polycarb Greenhouse 3 x 6ft. $279.99 This wooden frame polycarbonate greenhouse benefits from doubled up panel framing, giving a stronger and more durable build. Complete with 4mm polycarbonate glazing, a perfect thickness for insulation during the winter. Kerbside delivery.Polycarbonate.Polycarbonate windows.12 windows for ventilation.Take care when handling glazing.Polycarbonate roof panels to aid insulation during winter and provide shade during summer.Polycarbonate wall panels.Double door.Door frame size H163.5, W88cm / H5ft 4in, W2ft 8in.Ridge size H197.25cm / H6ft 6in.Annual treatment suggested.Packed flat for home assembly.2 person self assembly recommended.Manufacturer's 10 year guarantee (frame only).EAN/MPN/UPC/ISBN: 5060286275115.Please note that the base is not included with this product and should be purchased separatelyKerbside delivery only |
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BillyOh Wooden Polycarb Greenhouse 6 x 6ft. $329.99 This wooden frame polycarbonate greenhouse benefits from doubled up panel framing, giving a stronger and more durable build. Complete with 4mm polycarbonate glazing, a perfect thickness for insulation during the winter. Kerbside delivery.Polycarbonate.Polycarbonate windows.22 windows for ventilation.Take care when handling glazing.Polycarbonate roof panels to aid insulation during winter and provide shade during summer.Polycarbonate wall panels.Double door.Door frame size H163.5, W88cm / H5ft 4in, W2ft 8in.Ridge size H197.25cm / H6ft 6in.Annual treatment suggested.Packed flat for home assembly.2 person self assembly recommended.Manufacturer's 10 year guarantee (frame only).EAN/MPN/UPC/ISBN: 5060286275122.Please note that the base is not included with this product and should be purchased separatelyKerbside delivery only |
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BillyOh Wooden Polycarb Greenhouse 9 x 6ft. $419.99 This wooden frame polycarbonate greenhouse benefits from doubled up panel framing, giving a stronger and more durable build. Complete with 4mm polycarbonate glazing, a perfect thickness for insulation during the winter. Kerbside delivery.Polycarbonate.Polycarbonate windows.30 windows for ventilation.Take care when handling glazing.Polycarbonate roof panels to aid insulation during winter and provide shade during summer.Polycarbonate wall panels.Double door.Door frame size H163.5, W88cm / H5ft 4in, W2ft 8in.Ridge size H197.25cm / H6ft 6in.Annual treatment suggested.Packed flat for home assembly.2 person self assembly recommended.Manufacturer's 10 year guarantee (frame only).EAN/MPN/UPC/ISBN: 5060286275139.Please note that the base is not included with this product and should be purchased separatelyKerbside delivery only |
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BillyOh Wooden Polycarb Greenhouse 12 x 6ft. $499.99 This wooden frame polycarbonate greenhouse benefits from doubled up panel framing, giving a stronger and more durable build. Complete with 4mm polycarbonate glazing, a perfect thickness for insulation during the winter. Kerbside delivery.Polycarbonate.Polycarbonate windows.38 windows for ventilation.Take care when handling glazing.Polycarbonate roof panels to aid insulation during winter and provide shade during summer.Polycarbonate wall panels.Double door.Door frame size H163.5, W88cm / H5ft 4in, W2ft 8in.Ridge size H197.25cm / H6ft 6in.Annual treatment suggested.Packed flat for home assembly.2 person self assembly recommended.Manufacturer's 10 year guarantee (frame only).EAN/MPN/UPC/ISBN: 5060286275146.Please note that the base is not included with this product and should be purchased separatelyKerbside delivery only |
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Scosche / IPHN4 POLYCARB CS BLACK / IP4EBKV $31.59 Scosche - IPHN4 POLYCARB CS BLACK - IP4EBKV |
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Scosche Industries / Black Polycarb. Case -iPod Shu / IRMC $29.74 Scosche Industries - Black Polycarb. Case -iPod Shu - IRMC |
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Artograph 225317 4 EA. MidFilter PolyCarb Pads 1520 Filter Pak $55.25 4 each midfilter polycarb filter pads. The midfilter is a nonwoven airlaid polyester substrate with a green PVC binder on the exit side. Polycarb filter is a carbonimpregnated polyester offering high odor and further particletrapping efficiency. Note: Both filters should be replaced at the same time approximately every three months with regular use or when replacing the PreFilter Roll. |
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Artograph 225347 1530 Filter Pak 4 Ea. MidFilter PolyCarb Pads $87.75 4 each midfilter polycarb filter pads. The midfilter is a nonwoven airlaid polyester substrate with a green PVC binder on the exit side. Polycarb filter is a carbonimpregnated polyester offering high odor and further particletrapping efficiency. Note: Both filters should be replaced at the same time approximately every three months with regular use or when replacing the PreFilter Roll. |
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Artograph 225327 2025 Filter Pak 4 Ea. MidFilter PolyCarb Pads $74.59 4 each midfilter polycarb filter pads. The midfilter is a nonwoven airlaid polyester substrate with a green PVC binder on the exit side. Polycarb filter is a carbonimpregnated polyester offering high odor and further particletrapping efficiency. Note: Both filters should be replaced at the same time approximately every three months with regular use or when replacing the PreFilter Roll. |
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The Outdoor Outdoor Products 172WMCHNR Storage Box - External Dimensions 3.50" Height x 7.70" Width x 7.40" Depth - Polycarb... $16.89 The Outdoor Outdoor Products 172WMCHNR Storage Box - External Dimensions 3.50" Height x 7.70" Width x 7.40" Depth - Polycarb... |
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Scosche switchBACK G4 - Polycarb -3 Ba. Each $19.79 Manufacturer: Scosche. Each. The product is a polycarbonate case with interchangeable backs for iPhone 4. It includes one kickstand back for FaceTime video conferencing and landscape media viewing and two smooth backs. The integrated kickstand for conveni |
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TerraWave - 14X12X6 Polycarb NEMA 4 Enclosure $194.35 TERRAWAVE 14X12X6 Polycarbonate locking latch Enc. Incl Blank Bckplate, No Holes, no cord grip, mounting feet, and 2 vents with Rain Shields and Power. |
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Mega Duty Bkb Unit W/polycarb Board $3527.04 5 9/16" OD galvanized steel pole 72" safe play area Goal mounts directly through backboard to pole to virtually eliminate stress on backboard when hanging occurs 48" inground bury Includes 42" x 54" clear polycarbonate backboard and Ultimate double rim |
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Mega Duty BKB Unit with Polycarb Board $4049.48 5 9/16amp;quot; OD galvanized steel pole . 72amp;quot; safe play area . Goal mounts directly through backboard to pole to virtually eliminate stress on backboard when hanging occurs . 48amp;quot; inground bury . Includes 42amp;quot; x 54amp;quot;amp;nbsp;clear polycarbonate backboard and Ultimate double rim. |
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Scosche IRMC Black Polycarb. Case iPod Shu $33.63 IRMC BLACK tapSTICK Polycarbonate Case with integrated controls for Control play pause adjust volume skip tracks navigate playlists and activate the VoiceOver feature on your iPod shuffle (Gen 3) for use with any standard headphones or earbuds includes 3ft. audio cable for connecting to most stereo systemsthe high impact polycarbonate material protects against knocks and nicks |
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P7338-30EB - Progress Lighting - P7338-30EB $97.92 2 x 13W CFL Oval Polycarb Surf Mt. Outdoor |
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P7337-30EB - Progress Lighting - P7337-30EB $116.46 2 x 13W CFL Round Polycarb Surf Mt. Outdoor |
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P7340-30EB - Progress Lighting - P7340-30EB $83.88 26W CFL Outdoor Polycarb Ceiling w/acrylicIntegral Photocell |
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P7340-31EB - Progress Lighting - P7340-31EB $83.88 26W CFL Outdoor Polycarb Ceiling w/acrylicIntegral Photocell |
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P7341-30EB - Progress Lighting - P7341-30EB > Outdoor Flush Mount $63 2 x 26W CFL Outdoor Polycarb Ceiling w/acrylic |
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Cambro 20 Oz Hot/Cold Plastic Tumblers, Red, Pack of 72. Pack of 72 $639.18 Manufacturer: Cambro. Pack of 72. Customers also search for: Stackable Tumbler 20 Oz. - polycarb tumbler cup Cups Polycarb Tumblers |
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Duke Blue Devils Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Blue Devils pride with this Duke Blue Devils Water Bottle. Featuring a Duke Blue Devils 3-D wrapped team graphic- this Duke Blue Devils Water Bottle will ensure that nobody questions your dedication to the Duke Blue Devils. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Blue Devils fan Officially licensed |
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Pittsburgh Penguins Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Penguins pride with this Pittsburgh Penguins Water Bottle. Featuring a Pittsburgh Penguins 3-D wrapped team graphic- this Pittsburgh Penguins Water Bottle will ensure that nobody questions your dedication to the Pittsburgh Penguins. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Penguins fan Officially licensed by the NHL |
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New York Mets Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Mets pride with this New York Mets Water Bottle. Featuring a New York Mets 3-D wrapped team graphic- this New York Mets Water Bottle will ensure that nobody questions your dedication to the New York Mets. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Mets fan Officially licensed by MLB |
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Florida State Seminoles Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Seminoles pride with this Florida State Seminoles Water Bottle. Featuring a Florida State Seminoles 3-D wrapped team graphic- this Florida State Seminoles Water Bottle will ensure that nobody questions your dedication to the Florida State Seminoles. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Seminoles fan Officially licensed |
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Denver Broncos Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Broncos pride with this Denver Broncos Water Bottle. Featuring a Denver Broncos 3-D wrapped team graphic- this Denver Broncos Water Bottle will ensure that nobody questions your dedication to the Denver Broncos. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Broncos fan Officially licensed by the NFL |
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San Diego Chargers Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Chargers pride with this San Diego Chargers Water Bottle. Featuring a San Diego Chargers 3-D wrapped team graphic- this San Diego Chargers Water Bottle will ensure that nobody questions your dedication to the San Diego Chargers. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Chargers fan Officially licensed by the NFL |
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San Francisco 49ers Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream 49ers pride with this San Francisco 49ers Water Bottle. Featuring a San Francisco 49ers 3-D wrapped team graphic- this San Francisco 49ers Water Bottle will ensure that nobody questions your dedication to the San Francisco 49ers. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite 49ers fan Officially licensed by the NFL |
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New York Yankees Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Yankees pride with this New York Yankees Water Bottle. Featuring a New York Yankees 3-D wrapped team graphic- this New York Yankees Water Bottle will ensure that nobody questions your dedication to the New York Yankees. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Yankees fan Officially licensed by MLB |
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St. Louis Cardinals Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Cardinals pride with this St. Louis Cardinals Water Bottle. Featuring a St. Louis Cardinals 3-D wrapped team graphic- this St. Louis Cardinals Water Bottle will ensure that nobody questions your dedication to the St. Louis Cardinals. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Cardinals fan Officially licensed by MLB |
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Detroit Red Wings Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Red Wings pride with this Detroit Red Wings Water Bottle. Featuring a Detroit Red Wings 3-D wrapped team graphic- this Detroit Red Wings Water Bottle will ensure that nobody questions your dedication to the Detroit Red Wings. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Red Wings fan Officially licensed by the NHL |
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Penn State Nittany Lions Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Nittany Lions pride with this Penn State Nittany Lions Water Bottle. Featuring a Penn State Nittany Lions 3-D wrapped team graphic- this Penn State Nittany Lions Water Bottle will ensure that nobody questions your dedication to the Penn State Nittany Lions. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Nittany Lions fan Officially licensed |
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Arizona State Sun Devils Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Sun Devils pride with this Arizona State Sun Devils Water Bottle. Featuring a Arizona State Sun Devils 3-D wrapped team graphic- this Arizona State Sun Devils Water Bottle will ensure that nobody questions your dedication to the Arizona State Sun Devils. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Sun Devils fan Officially licensed |
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Auburn Tigers Water Bottle: 24oz Polycarb Water Bottle $15 Whether you're running a marathon or at your Saturday afternoon pick-up game- quench your thirst and scream Tigers pride with this Auburn Tigers Water Bottle. Featuring a Auburn Tigers 3-D wrapped team graphic- this Auburn Tigers Water Bottle will ensure that nobody questions your dedication to the Auburn Tigers. Brushed stainless steel screw-on lid and base 24 ounce capacity calls for less frequent refills Makes a perfect gift for your favorite Tigers fan Officially licensed |
