Main > Everything Else
Anyone know how to build a "VGA out" to a "component in" box?
MonMotha:
I'm not sure how what you're talking about even makes any sense. What is your signal source? Why do you need a SCART cable? Why are you talking about "pulling signals from an encoder chip"? Do you already have one of those chips in a circuit somewhere you're wanting to chop into? The CXA1145 (and AD725, and the Rohm part) are all pretty monolithic: RGB in, and either composite or s-video (Y/C) out. They do not make the Yb and Pr signals (which are interim steps to getting the "C" in Y/C s-video) available outside the chip.
Premade boxes to do this are all over the place. They are often sold under the term "transcoder". I see them on ebay with some frequency. You can also just look under "RGB to YPbPr" or "RGB to component" (even though the latter is somewhat of an unspecific, misused term, it's very common). Check google.
Frigo:
Ok, I want to do this:
http://www.youtube.com/user/phonedork#p/u/13/cOhntr-4xx0
without spending a whole lot of this:
:cheers:
MonMotha:
No flash, sorry, so I can't watch Youtube.
However, articles on the subject indicate that you either get S-Video or RGB out of a genesis. You'd need an outboard colorspace converter if you want YPbPr component. Just buy a box. If you're not skilled with this, you'll easily spend hours building and debugging it all to save maybe $20.
If you really want to build it, that LT circuit I posted should work. They have a suggestion for how to handle putting sync on Y (350 ohm switch to -3.3V, aka use a MOSFET or transistor and a ~350 ohm resistor). You'll probably need AC coupling caps since the genesis probably has DC offsets on its video outputs. 0.1uF ceramics inline with the incoming video signals between the 75 ohm termination resistor and the op-amp inputs should do nicely. You can build this on a single ~6V supply if you wish: just generate a false ground at 3V using a resistor divider and an extra op-amp wired up as a buffer and tie pin 4 of the left triple set to that false ground. AC coupling caps in the input (and outout) are then mandatory as your circuit would expect "black" to be at 3V.
You can potentially save yourself the expense of the Genesis SCART cable by hacking the end off a PC VGA cable and soldering the wires directly to the connector on the inside of the console. As a suggestion, use a cheaper cable: they tend to just have discrete wires rather than mini-coax, and so they'll be easier to deal with.
The cheapest option would be to hack the end of an s-video cable and solder it directly down to the appropriate places giving you a genesis with an s-video "tail". S-Video is almost as good as YPbPr component at standard def on a quality TV.
mvsfan:
Okay, this is somewhat related, but not completely. Does anyone make a device to properly up convert old devices like a Snes, so it looks good using the analog inputs on a new hdtv?
thankfully i still have old tube tvs that people gave me. Old video game systems look horrible using the analog inputs on a flat screen.
Samstag:
--- Quote from: mvsfan on November 04, 2010, 10:39:25 pm ---Okay, this is somewhat related, but not completely. Does anyone make a device to properly up convert old devices like a Snes, so it looks good using the analog inputs on a new hdtv?
thankfully i still have old tube tvs that people gave me. Old video game systems look horrible using the analog inputs on a flat screen.
--- End quote ---
Having a few beers before you play will give you that CRT look on an LCD TV. Or smear some vaseline on a pair of sunglasses.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version