The My Delta Pi webstore
Main page: www.mydeltapi.com
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The My Delta Pi webstore
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Main page: www.mydeltapi.com
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Computers and electronic equipment for hobby, work and laboratory use
Welcome to this online store where you can buy computers and all kinds of electronic equipment. Pleace click om a link to learn more or to buy.
Good computing and networking stores
Product examples - computers through UBid
Product examples - keyboards, printers and peripherials
Links to other product pages - hobby equipment, car equipment and musch more
Information about data store media
COMPUTERS AND NETWORKING STORES
Affordable high end computers and other electronic mashines: - Dyscern specializes in portable consumer electronics, especially high class electronic devices. By working with predominantly refurbished items, we are able to offer exceptional prices. We sell a cross section of products including MP3 players, iPods, HDTV’s, Computer Systems, Nintendo Wii, Xbox 360 and more. Our products tend to be higher ticket items, but sold for an affordable prize.
Computers and networking equipment: Here are 2 good online shops where you can find a lot of data equipment, like: Computers, Televisions, DVD Players / Recorders, Home Audio / Video, MP3 Players / iPod Accessories, Satellite Radio, Headphones, Mobile Audio / Video, GPS / Navigation, Home Electronics, Telephones & Fax, Personal Electronics, Electronic Accessories
GameSharkStore - Affordable game accessories - All types of equipment for all game-play consoles or bases, like contollers, wheels, joysticks, cables and faceplates.
CompuVest - a great data equipment shop
TheNerds.com - a great shop of technical products, including computers and network equipment
Accessories for all types of laptop equipment - from all brands and for all models for good prizes:
Examples: Laptop Batteries, PDA Batteries, MP3 Batteries, Digital. Camera Batteries, Camcorder Batteries, Universal Batteries, AC Adapters, Car Adapters, Airplane Adapters, Universal. Adapters, Printer Power Supplies, Chargers. GPS Receivers, Sync Cords, Fiber Optic Cables, HDMI. Cables, DC-DC Plugs • RPTV Lamps, Projector Lamps, iPod Accessories, MP3 Accessories, PDA Accessories. And more.
123InkJets - all types of in cartridges
: Here you can find inkjet cartridges for good prizes to most ink printers of most brands, examples: Newgen Sys, Next Comp, Nixdor, Nokia, North Atlantic, Northern Telecom, O Top , OCE, Okidata, Olivetti, Olympia, Omnifax, Omniprint, S Top, Sagem, Samsung, Sanyo, Savin, Scan-Code, Selex, P Top, Pacific Data, Panasonic, Philips, Pitney Bowes, Primera Tech, Privileg, Sharp, Siemens, Sony, Spec. Printing Sol, Stielow, Summagraphics, Sun Microsystems, T Top, Tally/Mannesmann, TEC, Tektronix, Telecheck, Telekom, Tidemark.You also find other accessories like: Laser toner, ribbons, solid ink, blank CD/DVD, scrapbooking and cables
(The exhibited products are only examples. By clicking at the links you get into a shop where you can search for a lot of other desktop or notebook computers.)
Computers products sold through uBid
uBid is an online auction
where you can bid on a lot of equipment types and often get quality goods for a
very good prize. The shop buys overstock goods cheaply from other stores and set
them on auction. Therefore their stock of merchanise is constantly changing. By
clicking at any of these product links you get access to the whole store and can
bid on whatever you find interesting.
Product examples - keyboards, printers,
periferials
ELECTRONIC KITS AND COMPONENTS
By clicking at this link, you will find all types of electronic components for hobby use and for professional use in laboratories. You will find electronic sets that can be used to build a lot of sevices and circuits. There are kits for building or installing specific electronic devices like power supplies, wave and pulse generators, measure devices, detectors, alarms, light effect generators, radio resceivers and transmitters and a lot more. You will also find specific components of every kind singly or in bulk.
Electronics Kits and components
- please click here
You will find electronic components or material of every sort in bulk or single: NTE electronic parts, capasitators, dials, knobs, diodes, relays, resistors, potetiomenters, semiconductors of every kind, transistors, diodes, thyristors, speaker wires, trimmers, hook up wire, wire ties, Heat Shrinkable Tubing - Thin Wall Polyoefin -2:1 Per Package-48in, Heat Shrinkable Tubing - Thin Wall Polyoefin -2:1 Per Package-6in, Heat Shrinkable Tubing - Dual Wall Polyoefin w/Adhesive-3:1 Per Package-6in.
RC helicopters and fast-winged aircrafts
More RC helicopters and fast-winged aircrafts
Advanced helicopter models - please click here and here
Back to main menu of all hobby and professional products
Light organs, psychedelic lights and light effect sets
Specific electronic equipment kits of many kinds
Electronic transmitters and transmitter kits
General elctronic kits
Alarm kits and security electronics
INFORMATION RESOURCES
About digital cameras of all kinds
About resistors, capacitators and inductors, please scroll down
Some important internet services explained - please scroll down
CD-ROM
This is a round disk to store data on that is set into a station on the computer when it is to be used.
Data are written and read optically, using a laser beam.
The basic technology is the same as in music and play CDs. However, a CD-rom must have a higher reliability that a music CD. Therefore much of the place in the CD-rom is used to store the information extra times, so that a fault do not detroy the ability to read data. Therefore a CD-rom generally has lower practical store capacity than a music CD.
The data is stored as small holes in a very thic metallic sheet on the disk. A traditional practical store capasity is 700 MB (mega-bytes), that is 700 million figures or letters. Now there are CD-ROMs with a capacity of 1 GB (giga-bytes), that is a billion figures or siffers.
A standard computer usually has a CD-reader (CD-station) and may also have a CD-burner used to store data on CDs. Once an area on a CD has been written on, it cannot be arased and rewritten.
However, written areas can be marked as invalid so that it is not read any more. When one commands a file to be erased on a CD, this is actually done. Updated versions of the data can then be rewritten on another area on the CD. Both these operations are usually done when one commands a restore of a file on the CD-rom.
In this way a CD can be used to store data, update the same data with new versions, and mark old versions of data as invalid.
Data is usually updated by storing a file a second time, and then the old version of the file is marked as invalid, but remains technically on the cd. Because updasting files and writing new files allways use new areas on the CD, each write an dupdate will consume some of the CD, and it vill eventually get filled up.
DVD-DISC
Also a DVD-disc is a round disk to be store data at, that is to set into a station on the computer when it is to be used.
Data are written and read optically, using a laser beam.
A DVD-disk is made up with the same basic technology as CD-roms. However the fromat of data stored is different. An important difference is that the disk contain less place-consuming techiques to detect and correct faults in the data than a CD-rom. Therefor a DVD can contain practically greater amount of data than a CD-rom, but the data may contain errors, and a DVD can therefore only be used in applications where such errors do bot have great consequences.
A standard DVD generally stores 4.7 GB (gigabytes) of data if it is single-layered and 8.5 gigabytes when double-layered.
Data is not stored doubly and the security mechanisms to detect faults are less
A DVD-disc can be a read only, called DVD-rom or a read-write disc. DVD-roms include replicated (factory pressed), recorded (burned), video, audio, and data DVDs.
As with CD-roms, areas on a DVD can only be witten once, but written areas can be marked as invalid, and the same files can be updated on another area. Thus files on a DVD can be written and updated many times, but each time some of the DVD is consumed.
There are severl DVD-formats: DVD-video for video footages, DVD-audio for sound-tracs and DVD-data to store data on.
The term DVD is also applied generically in describing newer video disc formats, Blu-ray Disc and HD DVD.
HD-DVD
Also a HD-DVD-disc is a round disk to be store data at, that is to set into a station on the computer when it is to be used. Data are written and read optically, using a laser beam.
HD-DVD is meant to be the successor of standard DVDs with a much higher data density.
HD-DVD can be found in read-only verions used for commersial music, videos and plays, and as read-write versions.
As with CD-roms and DVDs, areas on a HD-DVD can only be witten once, but written areas can be marked as invalid, and the same files can be updated on another area. Thus files on a HD-DVD can be written and updated many times, but each time some of the HD-DVD is consumed.
As with DVDs, the disc can be formated for several formats suited for Video, Audio or Data files.
HD-DVD disks are found in these versions_
12 cm, single sided 15 GB 30 GB
12 cm, double sided 30 GB 60 GB
8 cm, single sided 4.7 GB 9.4 GB
8 cm, double sided 9.4 GB 18.8 GB
BLU
-RayAlso a BLU-ray-disc is a round disk to be store data at, that is to set into a station on the computer when it is to be used. Data are written and read optically, using a laser beam.
A standard BLU-ray generally stores 25 or 50 GB (gigabytes) of data if it is single-layered and 50 or 100 gigabytes when double-layered.
As with CD-roms, areas on a DVD can only be witten once, but written areas can be marked as invalid, and the same files can be updated on another area. Thus files on a DVD can be written and updated many times, but each time some of the DVD is consumed.
Blu-ray technology uses a blu-violet laser bem to store and read data. This light has a much shorter wave-length that that of the red laser ligh used on CD-roms and DVDs. Therefore a much higher desity of data is possible.
Blu-ray disks are found in these versions_
12 cm, single
sided 25 GB or 50 GB
12 cm, double sided 50 GB or 100 GB
8 cm, single sided 7.8 GB or 15.6 GB
8 cm, double sided 15.6 GB or 31.2 GB
Flash memory cards and some other memory card types
Flash memory are based on semiconductor chips. On these chips there are transistors that can be made conducting or insulating by charging or decharging a port on the transistor. A transistor being conducting or insulating stores information bits. The charged ports are shielded in such a way that they can hold their charge in many years. Therefore the chips can hold information also when they are not connected to a source of charge.
In advanced flash memory cards, the chrarged port can hold several charge levels, and thus store emore than just one bit.
Flash chips are a type of EEPROMs. They are however different from other EEPROMS by not being erased or writen one byte at a time. A whole block on the card must be written at a time. By data update, a whole block must be both erased and rewritten.
The chip is integrated into a card that is set in a slot in the computer, telephone or other devices. These slots are physically standardized and with standardized hardwere.
Flash chips can have from a few kilobits to 2 GB (gigabits) of data stored, and more than one chip can be integrated in one card.
Flash memory cards are available in different speeds such as 2 MB per second, 12 MB per second, etc.
Flash memories are often combined with special file systems that optimally use the charcteristics of flash memory reding, erasing and writing. Examples of file systems used are FTL and FlashXC for PCs and JFFS, JFFS2 and JAFFS for Linux. The standards differ according to the size and shape of the card, the hardwere used to connect the computer to the card, and the file system used for this connection.
Here is a list of memory card standards used in different devices
| Name | Acronym | Form factor | DRM |
|---|---|---|---|
| PC Card | PCMCIA | 85.6 × 54 × 3.3 mm | None |
| CompactFlash I | CF-I | 43 × 36 × 3.3 mm | None |
| CompactFlash II | CF-II | 43 × 36 × 5.5 mm | None |
| SmartMedia | SM / SMC | 45 × 37 × 0.76 mm | None |
| Memory Stick | MS | 50.0 × 21.5 × 2.8 mm | MagicGate |
| Memory Stick Duo | MSD | 31.0 × 20.0 × 1.6 mm | MagicGate |
| Memory Stick Micro M2 | M2 | 15.0 × 12.5 × 1.2 mm | MagicGate |
| Multimedia Card | MMC | 32 × 24 × 1.5 mm | None |
| Reduced Size Multimedia Card | RS-MMC | 16 × 24 × 1.5 mm | None |
| MMCmicro Card | MMCmicro | 12 × 14 × 1.1 mm | None |
| Secure Digital Card | SD | 32 × 24 × 2.1 mm | CPRM |
| miniSD Card | miniSD | 21.5 × 20 × 1.4 mm | CPRM |
| microSD Card | microSD | 11 × 15 × 1 mm | CPRM |
| xD-Picture Card | xD | 20 × 25 × 1.7 mm | None |
| Intelligent Stick | iStick | 24 x 18 x 2.8 mm | None |
| Serial Flash Module | SFM | 45 x 15 mm | None |
| µ card | µcard | 32 x 24 x 1 mm | Unknown |
| NT Card | NT NT+ | 44 x 24 x 2.5 mm | None |
(The table is fetched from wikipedia.org, and it is therefore free to copy
and reuse)