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NFG Forums => RGB + Video Discussions => Topic started by: Agentspikey95 on February 21, 2005, 03:16:03 AM

Title: Quick Q About Dc Vga Box...
Post by: Agentspikey95 on February 21, 2005, 03:16:03 AM
In the schematic on GameSX, is the IC really needed?  
Title: Quick Q About Dc Vga Box...
Post by: Darkman on February 21, 2005, 03:38:33 AM
I guess it's for compatibility with certain monitors. I'm using a simple cable without a chip. It works with my 17" Sony CPD-G200 but not with my old no-name 15" monitor.
Title: Quick Q About Dc Vga Box...
Post by: Agentspikey95 on February 21, 2005, 05:31:40 AM
ok, then it should work with my 17" Philips. Thanks
Title: Quick Q About Dc Vga Box...
Post by: Agentspikey95 on February 21, 2005, 08:30:10 AM
Sorry for the double post, but do you happen to have a schematic? I'm not sure what i need or don't need...
Title: Quick Q About Dc Vga Box...
Post by: NFG on February 21, 2005, 12:34:35 PM
The buffer chip, unless I'm mistaken, basically ups the max current of the signal.  In the event your monitor needs more 'oomph' the buffer chip feeds it without having the DC's video chip suffer the extra drain.

Whether it's necessary or bad in the long term to not use it I dunno, but it's a thirty cent part.  Use it, I say.
Title: Quick Q About Dc Vga Box...
Post by: Agentspikey95 on February 21, 2005, 01:38:18 PM
ok then. Know where i can get one?
Title: Quick Q About Dc Vga Box...
Post by: NFG on February 21, 2005, 07:15:33 PM
Every time I look for parts people tell me to try Digikey.

So, uh, try Digikey.  =)

Title: Quick Q About Dc Vga Box...
Post by: Aidan on February 21, 2005, 08:09:39 PM
My suspicion is that the DC internally uses 3.3V logic, hence the sync outputs are at 3.3V. Buffering them with 5V logic brings them up to standard TTL levels, which some monitors may require.