Transcript Part3 - Home (www.dginter.net)

Power Supplies
Basics
Power Supply Unit aka PSU
Converts 110/220VAC to 3.3, ±5, ±12 VDC
There is a 5VDC standby in ATX PSU
Rating is in Watts. More is better.
– Range from 250 – 1000 (normal) – 2000
(super normal)
– Active Power Factor Correction is good.
– Efficiency is important
Connectors
ATX Power : P1
20 or 24 pins
AT Power : P8, P9
2 6-pin Connectors
(black to black)
Peripheral Power Connectors
Floppy (Berg, minimolex) Connector
(5,12VDC)
Standard (molex)
5,12 VDC
SATA : 3 each 3.3,5,12
VDC and 5 grounds
Display Technology
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How does it work?
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Program/CPU send an object to video card
Video card does graphic processing to add object
Video card sends a signal to the display device
(CRT or LCD)
Video Terminology
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Video Standards define resolution and # colors
Resolution is number of pixels i.e. 1024x768
Monochrome: pixel is off or on.
CGA: 320x240 Four colors
EGA: upto 640x350 16 colors (64 c. pallete)
VGA: 640x480 16 color or 320x240 256 color
Super VGA: 800x600 256 color (aka SVGA)
XGA: IBM only, 1024x768, 256 colors
Video Connectors
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Digital Video Interface (DVI)
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DVI-A Analog (????????)
DVI-D Digital
DVI-I Both
High Definition Multimedia Interface (HDMI)
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Extends DVI to faster frames, more res, digital
audio
Signal compatible with DVI. Need an adapter.
Analog Connections
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Component Video: different signals for Red,
Green and Blue (well kind of)
S-video: Small (PS2 like) composite Video
Composite: Sends all of the video signal on 1
RCA Connector
Monitors
Cathode Ray Tube (CRT) Sprays electrons at screen causing phosphors to glow
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Flat Panel: grid electrodes control each pixel.
Features:
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Characteristic
Description
Screen Size
Diagonal Length of Screen
Refresh Rate
Number of times the screen is “drawn” per
second
Interlaced
A Monitor which draws every other line on
each pass
Distance between pixels
Dot Pitch
Resolution
Multiscan
The number of (horizontal and vertical)
Pixels on a Screen
Monitors with multiple Refresh rates
LCD
LCD Types
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Active Matrix: 2 transistors control each pixel
Passive Matrix: Row/Column transistors
LCDs are Digital
LCDs have a native resolution. Everything else
is an approximation.
CRT
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Cathode: shoots a
beam of
electrons.
Deflected by
magnetism via 4
plates
Each Pixel made
up of 1 or more
groups of RGB
dots