Re: Help with an RGB Conversion...
- From: Adam Stouffer <adam_stouffer@xxxxxxxxxxx>
- Date: Sat, 12 Aug 2006 18:27:22 GMT
trelster wrote:
I am the owner of a recording studio in Minneapolis and we just
purchased a new (to us) recording console. The console is 20 years old
and runs off of a computer the same age. We've been trying to find a
solution for a video feed from RGB outputs. I have talked to every
electronics outfit in town, scoured the internet (including Google
Groups) and haven't been able to find a definitive solution for this.
Seems there are a number of different scenarios, and I would greatly
appreciate some help on this.
Here is the best I can describe what we have...
There are (of course) the 3 R, G and B outputs on the computer. In
addition, there is 1 Sync output, only 1. We have a 5 (one too many)
BNC to VGA cable, but I believe this is typically used to send signal
from VGA to RGB (right?). Along with the R, G & B on this cable, there
is a Vertial and Horizontal. We've tried connecting this cable to a
newer VGA monitor in a number of ways. There are 2 cases where we see
anything at all. First, when we connect any one of the colors to the
Sync we do see staticy Horizontal lines of that color. Also, when we
connect the Vertial Cable to the single sync output, the monitor
indicates a "frequency out of range" error. We are, on the other hand,
able to get a clear and steady signal on and older monochrome monitor
using a Single BNC to Single BNC cable, if we connect this cable to the
Green BNC output on the computer. We also get signal on the red and
blue, however the image isn't stable.
In any case, I'm looking for the most cost effective solution. I have
found a couple of older RGB monitors on Ebay, but all seem to have only
the 3 (R, G & B) inputs without the Sync input to match the Sync output
on our computer. If this will still work, great. We'll buy one. I'm
concerned about that fourth (Sync) output however.
Can someone tell me definitively if buying one of these monitors will
work? And if not, what a good cost effective solution would be?
Many thanks!
Eric
A440 Studios
How about this? Its not my design but I did use it before. A 2N3904 works in place of the BC548.
100 uF
! !
Green ----! !---------------------------------
-! !+ !
!
680E !
BC548 !
HSync ------------- __---------/\/\------o--------- CSync on Green
\ /!
\ /
---------
!
!
1k !
VSync ----/\/\----------
[note by the poster: for those guys who know exactly as much about electronics
as me, BC548 is a transistor, the /\/\ 's are resistors
and the 100uF is a condensator. :)
]
This one works perfectly without _ANY_ logical circuits and thus needs _NO_ 5 Volts or anything else ... ;)
Note: This works only with syncs that are active low, but since this is the default for _any_ sync signal, you would not have to expect any problems with this circuit.
Note2: when you build this with SMD you can put the whole circuit in the VGA connector of the cable. ;)
so long, MadMax. >>>--- for questions contact this guy!
.
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