: I was wondering if anyone knew of a place to get a preassembled
: SVGA -> sync on green adaptor for a fixed freqnency workstation monitor.
: I have read all the faq's, but I dunno how to make a circut like that.
: The adaptor would have to have either SVGA sytle plug (I have a svga
: -> 3 BNC adaptor cable, which I had assumed would include the circut
: that I had purchased, and havent returned yet). Or it would have to
: be just 3 bnc style plugs out, R G w/ sync and B.
: Anyway, Thanks in Advance...
: Randall Shutt
Sorry about all the html-tags ...
The article is shortened from http://www.hut.fi/~then,
where is much more this electronics-stuff ...
__________________________________________________clip
Subject: Howto VGA -> RGB CSync
Hi,
A while ago I was asking for a cable, to convert VGA to RGB with
Composite Sync on Green. You will need this, if somebody throws
away his old graphics workstation and you can get your hands on
the 21" fixed frequency flat screen black trinitron monitor and
want to hook it tou your Mach64 (don't know if a normal VGA
can handle that)
While there is a circuit available on the net somewhere else, this
one works perfectly for me and doesn't need any special parts. Please
note, that I'm only posting the circuit and didn't 'invent' it, so if
directly, since this guy can't read newsgroups very often.
note: german guys, sorry for the english :)
**************************************************************
FAQ maintainers: I think, this thing is the answer to a FAQ :)
**************************************************************
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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IRC : MadMax on #brezl, #gfrasta www : http://radawana.cg.tuwien.ac.at/~pr
and always remember: don't live for today ... tomorrow will never come !
(Dr. Shivago)
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Peter Stieglecker __o Department of Computer Graphics
phone: +43 (1) 588 01 / 4547 ( )_)(_/_)o Technical University of Vienna
fax: +43 (1) 587 49 32 o \ ( o Karlsplatz 13/186
irc: PeterGunn ;) O ) _ _) A-1040 Vienna, Austria, Europe
www: o(_/ )( Oo -------------------------------
http://www.cg.tuwien.ac.at/~pst/ o (__)o (: remotesignature (c) 1994 :)
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