Electrohome ECP 4100 Series Manual de usuario descargar pdf (Pagina 5)

Output connector:

75 ohm BNC connectors (you need 4 BNC connectors)

Wiring:

Red, Green, Blue and Composite Sync lines should be

wired using 75 ohm coaxial cable.

If you are building my TTL level output model, you can leave out R3-R8 and T1-T2 out of this list.

Getting your equipment to accept signal from PC

Many modern compter monitors are multisync monitors which accedpt easily wide selection of different refresh

rates, scan frequencies and resolutions. This same applies to modern data projectors. But many older monitors

(monitors not made for PC) and video projectors can't accept the signals your VGA card puts out.

If your video projection system or monitor don't accept VGA scanning frequences you have to get a suitable driver

for adjusting your VGA frequencies. For normal VGA modes the horizonal sync frequency is 31250 Hz and vertical

sync frequency is 60 or 72 Hz. For information about SuperVGA modes you have to consult you display card

adapter technical data.

Another use for the same circuit is to connect to connect VGA card to a large old color monitor from an old

workstation. If you manage to set your VGA adapter to generate suitable scanning frequecies for the monitor you

have, you can use it with your VGA card. For more information how to do this, check the Fixed Frequency PC

Video FAQ.

How to find fixed frequency monitor technical data

Befor you can start eny useful experimenting have to find out the horizonal frequency and the refresh rates your

monitor needs. If you try to use the monitor with wrong frequency signals the monitor does not work properly and

some monitors can be damaged if you try to use them at wrong frequency.

Your monitor user's guide technical info section is the first place to check. If that does not help try the

manufacturer's website. Monitor databases like The World Wide Web Monitor Database and Apple Macintosh

Monitor Database are very useful information sources for getting this information. If you can't find any technical info

on the exact monitor you have you might check the information about some very similar monitor model (for

example some older revision of that model) and use it as some kind starting point. If you know the computer model

where the monitor was connected you can try to look at the technical specs or some FAQ of that computer (if you

get to know what kind of signal that computer has sent to monitor you know that the monitor can at least show it).

How to configure Windows

Your video card drivers quite propably has options to set the the screen refresh rate. Check you graphics card

manual and driver documents how to adjust those settings (this depends on graphics cards). Try to find a refresh

rate and resolution which matches you monitor specifications. Typically the selections in typical drivers are quite

limited and many driver's don't have any further options for user customization.

Matrox has added excellent user configurability oprtions for their Millenium and Mystique graphics card Windows

95 drivers. For more information take a look at my info page how to confire Matrox cards to TV frequencies

because thet page has also lots of information how to change tha settings and this information is useful if you have

to make configuration for some fixed frequency monitor you have.

Configuting Linux XFree86 for fixed frequency monitors

Linux XFree86 has excellent user configurability by editing XF86Config file which has all necessary video card

parameters in it and that file can be edited with any ASCII editor. Changing those parameters in gonfiguation file

properlu needs some experinece. For more information on configuring XFree86 take a look at Use your old

Workstation Monitors with Linux/XFree86 and The Hitchhiker's Guide to X386/XFree86 Video Timing.

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