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.

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Presentation transcript:

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, mini- molex) Connector (5,12VDC) Standard (molex) 5,12 VDC SATA : 3 each 3.3,5,12 VDC and 5 grounds

Display Technology How does it work? How does it work? Program/CPU send an object to video card Program/CPU send an object to video card Video card does graphic processing to add object Video card does graphic processing to add object Video card sends a signal to the display device (CRT or LCD) Video card sends a signal to the display device (CRT or LCD)

Video Terminology Video Standards define resolution and # colors Video Standards define resolution and # colors Resolution is number of pixels i.e. 1024x768 Resolution is number of pixels i.e. 1024x768 Monochrome: pixel is off or on. Monochrome: pixel is off or on. CGA: 320x240 Four colors CGA: 320x240 Four colors EGA: upto 640x colors (64 c. pallete) EGA: upto 640x colors (64 c. pallete) VGA: 640x color or 320x color VGA: 640x color or 320x color Super VGA: 800x color (aka SVGA) Super VGA: 800x color (aka SVGA) XGA: IBM only, 1024x768, 256 colors XGA: IBM only, 1024x768, 256 colors

Video Connectors Digital Video Interface (DVI) Digital Video Interface (DVI) DVI-A Analog (????????) DVI-A Analog (????????) DVI-D Digital DVI-D Digital DVI-I Both DVI-I Both High Definition Multimedia Interface (HDMI) High Definition Multimedia Interface (HDMI) Extends DVI to faster frames, more res, digital audio Extends DVI to faster frames, more res, digital audio Signal compatible with DVI. Need an adapter. Signal compatible with DVI. Need an adapter.

Analog Connections Component Video: different signals for Red, Green and Blue (well kind of) Component Video: different signals for Red, Green and Blue (well kind of) S-video: Small (PS2 like) composite Video S-video: Small (PS2 like) composite Video Composite: Sends all of the video signal on 1 RCA Connector Composite: Sends all of the video signal on 1 RCA Connector

Monitors Cathode Ray Tube (CRT) Sprays electrons at screen causing phosphors to glow Cathode Ray Tube (CRT) Sprays electrons at screen causing phosphors to glow Flat Panel: grid electrodes control each pixel. Flat Panel: grid electrodes control each pixel.Features: CharacteristicDescription 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 Dot Pitch Distance between pixels Resolution The number of (horizontal and vertical) Pixels on a Screen Multiscan Monitors with multiple Refresh rates

LCD

LCD Types Active Matrix: 2 transistors control each pixel Active Matrix: 2 transistors control each pixel Passive Matrix: Row/Column transistors Passive Matrix: Row/Column transistors LCDs are Digital LCDs are Digital LCDs have a native resolution. Everything else is an approximation. LCDs have a native resolution. Everything else is an approximation.

CRT Cathode: shoots a beam of electrons. Cathode: shoots a beam of electrons. Deflected by magnetism via 4 plates Deflected by magnetism via 4 plates Each Pixel made up of 1 or more groups of RGB dots Each Pixel made up of 1 or more groups of RGB dots