Post by: akram on April 05, 2005, 09:57:00 AM
First of all, i have a schematics of a xbox vga adapter circuit by ben gasper, but i dont know if it works.
If someone know or have tested it , pleaseeeeeeee answer this topic.
i want to use the xbox like a pc with linux and i want to make a vga adapter on my own.
thx
PD- if i have our permisiion i could post the schematics here.
Post by: fahrenheit on April 05, 2005, 03:31:00 PM
Post by: akram on April 06, 2005, 08:21:00 AM
PD.- i think i could post this link if icoulndt pls modify, thx
Post by: fahrenheit on April 06, 2005, 05:09:00 PM
Post by: davemk on April 06, 2005, 09:16:00 PM
Post by: akram on April 07, 2005, 09:09:00 AM
Post by: Jameson42 on April 08, 2005, 03:10:00 PM
Post by: HAMDAWG on April 09, 2005, 10:40:00 AM
1
2
3
This post has been edited by HAMDAWG: Apr 9 2005, 05:44 PM
Post by: akram on April 09, 2005, 02:39:00 PM
P.D.- Sorry for my poor english.
Post by: Jameson42 on April 09, 2005, 06:25:00 PM
Post by: Foe-hammer on April 10, 2005, 03:52:00 AM
; I miss it. He is a great guy who builds a great vga adapter. I had him build me one, and it works perfectly with all versions of the xbox. It is a transcoder, just like the x2vga, thus no vga bios is required.
Post by: akram on April 10, 2005, 08:45:00 AM
I have some question to do:
1º header 6 ??? this is the conector of the xbox? this pines are generics or they are from the xbox conector?
2º header 2 ??? its the vcc?? its a part of the xbox output conector?? i only know that i must apply 5 volts
if someone know some info about the pins out of the video wire out of xbox, plssssssssssssssss reply this post
P.D.- That dudes are for my poor ewnglish, because i dont understand some words that are more dificult for me because the translator i use itsnt well as i think. I could star to make it this monday, if its works i will report Xd (pls work work)
Thanks a lot for your help boys
Post by: Foe-hammer on April 10, 2005, 11:54:00 PM
These I think are the original schematics that Ken made, and the only problem with it is that 720p is a little too dark, but 480p works perfectly.
Post by: The Zep Man on May 23, 2005, 01:55:00 PM
[edit]
Sorry. Server reported that it was down a moment ago. My bad.
Post by: greengiant on June 03, 2005, 01:23:00 AM
I prob messed up somewhere in my prototype... actually let me start by saying I started analyzing a few VGA adapters out on the market such as the X2VGA and few others, one is the aformentioned by Ken Gasper.
The better ones all have one thing in common, a Max4383 and a sync seperator.
(If anyone wants more detailed depth of how the more advanced devices such as the X2VGA works feel free to ask)
Well I was going to make the Gasper version, and I have the pcb and everything made up, just arrived today. Well it works quite nicely, but due to some errors in my resistor selection or .... I had to re-create the schematic from the PDF so I can then make a proper PCB, so possibly I introduced an error into the schematic in the proccess....well I get RED video. LOL. Ive checked, the basic video output, but oviously i did something wrong, so I will check it more tommorow.
So to come to the present, it works nicely but when its built properly.
Some problems, are that you need to make sure there is little interference between the three video signals (see x2vga pcb for example) secondly, you need to have EXACT (at least EXACT values in some places in order to get the proper colors) a small change of a few ohms/kohms in a special resistor can mean the difference between a purple blue and the proper blue.
Im gonna test and debug some more tommorow, and see what went wrong. I may move to using two Max's to properly correct the video levels, but thats later on.
Post by: Jameson42 on June 05, 2005, 03:57:00 PM
Post by: thecowsays on June 06, 2005, 09:13:00 AM
free shipping, too!
Post by: lostboyz on June 06, 2005, 10:34:00 AM
https://www.national.com/
just dont use a @yahoo, @msn adress or they will charge you
Post by: greengiant on June 10, 2005, 07:28:00 PM
assembly - nope, was made in factoryc) the new schematic - most likely, when passing over the schematic in PDF to a real schematic in protel, i may have mis-connected some wire.
Anyone else built this unit and works ?
Post by: greengiant on June 14, 2005, 11:09:00 PM
the max4383 does not come available in dip, only soic.
Post by: TB_88 on June 22, 2005, 11:04:00 PM
maybe even link to places for free samples..
Does it work with MS Bios without green tint?
Pics also plz, just so I know if it fits in my HD-Pack.
Post by: TB_88 on June 22, 2005, 11:13:00 PM
. Maybe I could pay that one with Paypal..
Post by: Chad N. on June 29, 2005, 06:09:00 PM
Cimarron Technology
Post by: HaloFool90 on July 01, 2005, 10:53:00 PM
Post by: ryn_o on July 11, 2005, 12:47:00 PM
Post by: ryn_o on July 11, 2005, 05:41:00 PM
Post by: Jameson42 on July 11, 2005, 06:09:00 PM
Post by: ryn_o on July 11, 2005, 09:19:00 PM
Post by: Jameson42 on July 11, 2005, 10:20:00 PM
VCC is pin 1. on the advanced or HD a/v pack, this will connect to the middle of 3 pins on the optical audio out.
I don't know because I haven't actually built this thing yet, but 1080i should work... the colors might be a little off (like it might be too dark or something). The sync seperator will work for that resolution, though your monitor may or may not support the resolution.
Post by: ryn_o on July 11, 2005, 10:36:00 PM
Post by: ryn_o on July 12, 2005, 10:48:00 PM
Post by: Jameson42 on July 13, 2005, 06:50:00 AM
There is no way that this will hurt your monitor. Once you connect the YPbPr to the inputs, and actually have a signal, RGB will output in AC. They will never give you more than 5V, which is perfectly safe for your monitor.
Post by: JaredC01 on July 16, 2005, 02:06:00 PM
QUOTE(Jameson42 @ Jul 13 2005, 08:01 AM)
rfguy,
-
Title: Vga Box For Xbox
Post by: DarkLegion on July 17, 2005, 10:16:00 PM
-
Most likely it is a black level clamp.
-
Title: Vga Box For Xbox
Post by: Chad N. on July 18, 2005, 04:47:00 AM
-
rfguy, it looks like I may have the same problem as you. My monitor comes up with an error message: "out of range", then tells me the horizontal sync is at 37.3 kHz and the vertical sync is 249 Hz.
The input specs for my monitor are 30-95 kHz for horizontal and 50-160 Hz vertical. Looks like the 1881 is outputting too high of a vertical frequency.
I am using an Intersil 1881 vs National's 1881, but that shouldn't make a difference.
You might try reading the horizontal and vertical syncs from your circuit on the oscilloscope, and finding exactly what frequency they are outputting at. (I don't have an oscilloscope at home).
If they are outside your monitor's specs, the next question is: how to change the horizontal/vertical sync output independantly of each other.
-
Title: Vga Box For Xbox
Post by: rfguy on July 19, 2005, 02:01:00 AM
-
First of all I am not very familiar with video signals. So let me tell you what I observed and than you guys can tell me if it makes sense.
I think the problem is on the horizontal sync. On the pin 1 of LM1881 I measured horizontal sync along with a whole bunch of other signals. My scope is old analog so I cannot do a single shot or storage. Now when I read the data sheet it makes sense to me. Pin 1 is the "composite sync", so it is the combination of horiziontal and vertical sync and some other junk. However, the monitor VGA input is expecting a pure horizontal sync. I verified it by measure what's coming out of my computer video card. So using pin 1 of LM1881 will not work.
I think the LM1881 should be replaced by EL4583 which is similar to LM1881 but it also has a dedicated pure horizontal sync out. What do you think?
-
Title: Vga Box For Xbox
Post by: Chad N. on July 19, 2005, 06:01:00 AM
-
I got the circuit to work....somewhat. After reading the 1881 datasheet, I discovered the vertical sync frequency is controlled by the resistor value at reset (pin 6). The value used on Ken's schematic is 340Kohms, while the 1881 datasheet tells you to use 680K for NTSC.
The lower the resistor value, the higher the vert sync freq is. I used the recommended 680K and it worked. According to the datasheet, 340K would output a frequency far outside all monitor's range.
For unmodified schematics to work, you would have to have a monitor capable of at least a 250 Hz refresh rate.
Now for the problems:
There are faint green horizontal bands slowly moving up the screen.
Also, 480P is the only resolution to work. With 720P and 1080i, the sync frequencies get outside the monitor's range again.
The good:
Ignoring the green bands, the 480P picture is perfect!!!! A far cry from the crap Viewsonic N6 video processor I have.
Were those of you that got it to work using LCD monitors? LCDs handle refresh rates differently, but I forgot how. I have a suspicion that this won't work well with CRTs.....only LCDs.
-
Title: Vga Box For Xbox
Post by: rfguy on July 19, 2005, 02:10:00 PM
-
Chad, this is good news. So you followed the schematic except the 340K? I think I'll try that, but I still don't understand the composite sync thing. I hope something can explain that to me. BTW, can you do me a favor and measure the R,G,B output without anything in the input? I just want to verify that the DC voltage a thte output is normal even though it is AC coupled. Thanks.
-
Title: Vga Box For Xbox
Post by: greengiant on July 20, 2005, 03:35:00 AM
-
I also have the problems posted, excpet I do get video but with the red haze as previously noted. I will be trying to use the different resistor for the LM1881 but dont expect my results to change, as I have tried to feed the monitor a variety of different frequencys with a signal generator, and the video goes thru the range but the problems still persist.
As someone pointed out before, the 2nd op amp idea is USED in a commercially available product..... the x2vga.
Ive decomposed it to the last piece, except for 2 ic's.
I know exactly how the device works, its very neat how they did it, im guessing its an improvement upon the 3rd (private) revision of Ken Gasper.
Essentially, they have the 2 max's (op amps) to do proper conversion of the video, the sync signals are either send from the LM to the monitor un changed, or when u enable the 'quick view' thingy, it passes it thru 2 ic's that double the sync so that the monitor is able to see the video (crappy, but see it)
such as 480i 15khz is doubled to 30khz. One ic does the conversion/pass-thru and the other controls the first ic, and the led.
What the part number on these ic's are, i dont know. One IC uses a clock (the control IC) so Im guessing its a MCU (possibly a microchip 16f) but the 1st ic that does the doubling of the synch i have no clue.
Well if anyone has the x2vga they should be able to decompose it better, or gather more intel. As for legality, its based on Ken Gaspers design so in theory is public domain.
Enjoy !
-
Title: Vga Box For Xbox
Post by: Jameson42 on July 20, 2005, 09:48:00 AM
-
I'm guessing your monitor doesn't support those resolutions. 720p = 1280x720. Kinda an exotic resolution for most monitors. The composite sync should still be readable by your monitor as a proper vertical sync signal.
You can get your 5V supply through the xbox's AV port... check out JaredC01's A/V guide for some more info.
-
Title: Vga Box For Xbox
Post by: Chad N. on July 25, 2005, 11:09:00 AM
-
Rfguy, what about an EL1883? It is very similar to the 1881, but also has horizontal output. It is an 8 pin just like the 1881, but I think they only come as surface mount. Digikey has them for $3.
You might try this one instead to see how it works.
By the way what LCD monitor did you try it on? I tried mine on a CMV-520D LCD and it didn't work either.
-
Title: Vga Box For Xbox
Post by: rfguy on July 25, 2005, 12:57:00 PM
-
Chad, thanks for checking out EL1883. I believe EL1883 should work. Let me check the data sheet later tonight. The problem with digikey is that I don't want to buy a $3 item and pay $5 for shipping and handling. I usually wait until I have $25 or more worth of stuff and then order. I always prefer to grab parts from local surplus stores in the silicon valley.
My LCD is a real cheap one. I bought it used and it is a MAG 14 inches old model. I don't have the model number but I can look it up when I get home tonight. Anyway, you can check the manual of you lcd. Sometims it will tell you what the sync requirements are. However, mine doesn't have that information in the manual.
BTW, if you are interested go to this website
http://www.epanorama...vgamonitor.html
It mentions the LM1881 composite sync. There is a simple circuit the author claims that should be able to extract the Hsync from composite sync. I built it and it did not work at all. Actually I ran throught the logic and it didn't make sense to me.
-
Title: Vga Box For Xbox
Post by: Chad N. on July 27, 2005, 07:47:00 AM
-
Thanks for the link! From it I learned to disconnect the vertical sync signal out to vga. It worked! Apparently my LCD only needs a horizontal sync.....it won't lock on with horizontal AND vertical. I'll put a switch in line with the vertical sync out:
closed for CRT and open for LCDs.
Now to fix problems with resolutions higher than 480P:
I think the problem with higher resolutions is, the horizontal sync increases as resolution goes up. 720P and 1080i have a frequency outside many monitor's range.
With another CRT I logged horizontal sync frequency with each resolution:
640x480: 37 kHz
800x600: 46 kHz
1024x768: 60 kHz
1280x1024: 80 kHz
1600x1200: 94 kHz
720 is 1280x720 so you need a monitor that can handle H sync of at least 80 kHz
1080 is 1920x1080, so I am guessing you need at least 100 kHz for that
Now the question becomes how can you change the H sync out so it is low enough to be within your particular monitor's range?
-
Title: Vga Box For Xbox
Post by: massive_hair on July 29, 2005, 10:56:00 AM
-
Heya. As I live in the UK getting hold of the MAX4383 is a nightmare. The best op amps I can get are for audio applications - the LM837N is a quad op-amp, or the NE5534AN is a single op amp (both from www.maplin.co.uk - datasheets available). Are there likely to be any major headaches from using these?
Sadly I can't get hold of a EL4583 either but I think my monitor will take composite sync... fingers crossed!
Cheers
Chris
-
Title: Vga Box For Xbox
Post by: rfguy on July 29, 2005, 01:06:00 PM
-
Try www.digikey.com. They have almost everything and I believe they ship international. NE5534 or anything in the audio band are not acceptable because of the low bandwidth. You need amplifier design for video with high bandwidth and slew rate.
You can also try this website
http://translate.goo...l=e...6lr=&sa=N
This is the equivalent of Ken Gasper design and use a different amplifier IC. You should be able to get it from digikey. I know it's hard to read the translation, but you should be able to read the circuit diagram.
You can also get the EL1883 from digikey too!
By the way, I have not ordered the EL1883 for my board yet, but I was doing some experiment with my current board. What I did was to add a monostable (74HC123) at the output of the LM1881 pin1. Everytime the composite sync goes low a pulse (length adjustable in my case) is generated at the monostable output. I just adjust the pulse width with the oscilloscope to get about 27usec. This pulse becomes the Hsync for the LCD, and I use the pin3 of LM1881 as Vsync for the LCD. It works for a while but sometimes it will lose sync. Anyway, I'll play with it later on today. This is just some experiments before I get the EL1883.
-
Title: Vga Box For Xbox
Post by: Foe-hammer on July 30, 2005, 04:19:00 AM
-
H freq:
480i = 15 kHz
480p = 31 kHz
1080i = 33 kHz
720p = 45 kHz
Tested and confirmed.
All monitors will support 480p and up freq.
Most monitors will not support 480i freq.
-
Title: Vga Box For Xbox
Post by: Carlo210 on August 01, 2005, 09:40:00 PM
-
Post by: DarkLegion on July 17, 2005, 10:16:00 PM
QUOTE(rfguy @ Jul 17 2005, 04:19 PM)
However, there is also a diode before each cap. I don't know what that is for. Maybe a protection or level clamp.
Most likely it is a black level clamp.
Post by: Chad N. on July 18, 2005, 04:47:00 AM
The input specs for my monitor are 30-95 kHz for horizontal and 50-160 Hz vertical. Looks like the 1881 is outputting too high of a vertical frequency.
I am using an Intersil 1881 vs National's 1881, but that shouldn't make a difference.
You might try reading the horizontal and vertical syncs from your circuit on the oscilloscope, and finding exactly what frequency they are outputting at. (I don't have an oscilloscope at home).
If they are outside your monitor's specs, the next question is: how to change the horizontal/vertical sync output independantly of each other.
Post by: rfguy on July 19, 2005, 02:01:00 AM
I think the problem is on the horizontal sync. On the pin 1 of LM1881 I measured horizontal sync along with a whole bunch of other signals. My scope is old analog so I cannot do a single shot or storage. Now when I read the data sheet it makes sense to me. Pin 1 is the "composite sync", so it is the combination of horiziontal and vertical sync and some other junk. However, the monitor VGA input is expecting a pure horizontal sync. I verified it by measure what's coming out of my computer video card. So using pin 1 of LM1881 will not work.
I think the LM1881 should be replaced by EL4583 which is similar to LM1881 but it also has a dedicated pure horizontal sync out. What do you think?
Post by: Chad N. on July 19, 2005, 06:01:00 AM
The lower the resistor value, the higher the vert sync freq is. I used the recommended 680K and it worked. According to the datasheet, 340K would output a frequency far outside all monitor's range.
For unmodified schematics to work, you would have to have a monitor capable of at least a 250 Hz refresh rate.
Now for the problems:
There are faint green horizontal bands slowly moving up the screen.
Also, 480P is the only resolution to work. With 720P and 1080i, the sync frequencies get outside the monitor's range again.
The good:
Ignoring the green bands, the 480P picture is perfect!!!! A far cry from the crap Viewsonic N6 video processor I have.
Were those of you that got it to work using LCD monitors? LCDs handle refresh rates differently, but I forgot how. I have a suspicion that this won't work well with CRTs.....only LCDs.
Post by: rfguy on July 19, 2005, 02:10:00 PM
Post by: greengiant on July 20, 2005, 03:35:00 AM
As someone pointed out before, the 2nd op amp idea is USED in a commercially available product..... the x2vga.
Ive decomposed it to the last piece, except for 2 ic's.
I know exactly how the device works, its very neat how they did it, im guessing its an improvement upon the 3rd (private) revision of Ken Gasper.
Essentially, they have the 2 max's (op amps) to do proper conversion of the video, the sync signals are either send from the LM to the monitor un changed, or when u enable the 'quick view' thingy, it passes it thru 2 ic's that double the sync so that the monitor is able to see the video (crappy, but see it)
such as 480i 15khz is doubled to 30khz. One ic does the conversion/pass-thru and the other controls the first ic, and the led.
What the part number on these ic's are, i dont know. One IC uses a clock (the control IC) so Im guessing its a MCU (possibly a microchip 16f) but the 1st ic that does the doubling of the synch i have no clue.
Well if anyone has the x2vga they should be able to decompose it better, or gather more intel. As for legality, its based on Ken Gaspers design so in theory is public domain.
Enjoy !
Post by: Jameson42 on July 20, 2005, 09:48:00 AM
QUOTE
With nothing on the input, red reads .75V / green: 1.9 / blue: .45
I don't understand the composite sync thing either, or why the vertical sync jumps up out of range when 720P or 1080i is enabled.
I don't understand the composite sync thing either, or why the vertical sync jumps up out of range when 720P or 1080i is enabled.
I'm guessing your monitor doesn't support those resolutions. 720p = 1280x720. Kinda an exotic resolution for most monitors. The composite sync should still be readable by your monitor as a proper vertical sync signal.
QUOTE
I did solve my green horizontal band problem: the AC to DC converter I was using for the 5v power supply was poor quality and letting some 60Hz through.
You can get your 5V supply through the xbox's AV port... check out JaredC01's A/V guide for some more info.
Post by: Chad N. on July 25, 2005, 11:09:00 AM
You might try this one instead to see how it works.
By the way what LCD monitor did you try it on? I tried mine on a CMV-520D LCD and it didn't work either.
Post by: rfguy on July 25, 2005, 12:57:00 PM
My LCD is a real cheap one. I bought it used and it is a MAG 14 inches old model. I don't have the model number but I can look it up when I get home tonight. Anyway, you can check the manual of you lcd. Sometims it will tell you what the sync requirements are. However, mine doesn't have that information in the manual.
BTW, if you are interested go to this website
http://www.epanorama...vgamonitor.html
It mentions the LM1881 composite sync. There is a simple circuit the author claims that should be able to extract the Hsync from composite sync. I built it and it did not work at all. Actually I ran throught the logic and it didn't make sense to me.
Post by: Chad N. on July 27, 2005, 07:47:00 AM
closed for CRT and open for LCDs.
Now to fix problems with resolutions higher than 480P:
I think the problem with higher resolutions is, the horizontal sync increases as resolution goes up. 720P and 1080i have a frequency outside many monitor's range.
With another CRT I logged horizontal sync frequency with each resolution:
640x480: 37 kHz
800x600: 46 kHz
1024x768: 60 kHz
1280x1024: 80 kHz
1600x1200: 94 kHz
720 is 1280x720 so you need a monitor that can handle H sync of at least 80 kHz
1080 is 1920x1080, so I am guessing you need at least 100 kHz for that
Now the question becomes how can you change the H sync out so it is low enough to be within your particular monitor's range?
Post by: massive_hair on July 29, 2005, 10:56:00 AM
Sadly I can't get hold of a EL4583 either but I think my monitor will take composite sync... fingers crossed!
Cheers
Chris
Post by: rfguy on July 29, 2005, 01:06:00 PM
You can also try this website
http://translate.goo...l=e...6lr=&sa=N
This is the equivalent of Ken Gasper design and use a different amplifier IC. You should be able to get it from digikey. I know it's hard to read the translation, but you should be able to read the circuit diagram.
You can also get the EL1883 from digikey too!
By the way, I have not ordered the EL1883 for my board yet, but I was doing some experiment with my current board. What I did was to add a monostable (74HC123) at the output of the LM1881 pin1. Everytime the composite sync goes low a pulse (length adjustable in my case) is generated at the monostable output. I just adjust the pulse width with the oscilloscope to get about 27usec. This pulse becomes the Hsync for the LCD, and I use the pin3 of LM1881 as Vsync for the LCD. It works for a while but sometimes it will lose sync. Anyway, I'll play with it later on today. This is just some experiments before I get the EL1883.
Post by: Foe-hammer on July 30, 2005, 04:19:00 AM
480i = 15 kHz
480p = 31 kHz
1080i = 33 kHz
720p = 45 kHz
Tested and confirmed.
All monitors will support 480p and up freq.
Most monitors will not support 480i freq.
Post by: Carlo210 on August 01, 2005, 09:40:00 PM
QUOTE(Jameson42 @ Jul 20 2005, 05:59 PM)
I'm guessing your monitor doesn't support those resolutions. 720p = 1280x720. Kinda an exotic resolution for most monitors.
-
Title: Vga Box For Xbox
Post by: Chad N. on August 16, 2005, 08:58:00 PM
-
Does anyone know of Ken Gasper's current e-mail address? I would like the schematics of his last version of the transcoder, as well as permission to post the schematic on other websites.
-
Title: Vga Box For Xbox
Post by: jude on August 18, 2005, 07:49:00 AM
-
when no-else is about. Bought it on ebay shipped from hong kong , works fine, and also does tv with a arial.
-
Title: Vga Box For Xbox
Post by: The Zep Man on August 20, 2005, 02:56:00 AM
-
Post by: Chad N. on August 16, 2005, 08:58:00 PM
Post by: jude on August 18, 2005, 07:49:00 AM
when no-else is about. Bought it on ebay shipped from hong kong , works fine, and also does tv with a arial.
Post by: The Zep Man on August 20, 2005, 02:56:00 AM
QUOTE(Foe-hammer @ Jul 30 2005, 12:30 PM)
H freq:
-
Title: Vga Box For Xbox
Post by: Jameson42 on August 20, 2005, 09:21:00 AM
-
yeah, the only resolution that all VGA monitors will support is 640x480 (and technically, a couple resolutions below that). everything beyond 640x480 is technically SVGA, EVGA, or XVGA... I don't remember the difference.
-
Title: Vga Box For Xbox
Post by: Foe-hammer on October 18, 2005, 11:46:00 PM
-
Post by: Jameson42 on August 20, 2005, 09:21:00 AM
Post by: Foe-hammer on October 18, 2005, 11:46:00 PM
QUOTE(The Zep Man @ Aug 20 2005, 03:07 AM)
Sorry, but I find the bolded text hard to believe. 720*480 (480p) isn't a standard resolution and I have tested this on some older monitors of mine. A few didn't support it.
-
Title: Vga Box For Xbox
Post by: akram on October 20, 2005, 12:37:00 PM
-
WOW hi to everyone ^^, i havent internet for a few time and i cant read the forum U_U, im trying searching the max4383, if somebody could help me selling me one o say me where i could found it.
Im form spain.
THX
-
Title: Vga Box For Xbox
Post by: DarkLegion on October 21, 2005, 04:11:00 PM
-
You guys looking to build a transcoder might want to take a look at a chip made by National here: http://www.national....LM/LMH1251.html
Seems to require very little external parts and includes sync seperation built in and even VGA passthrough if needed.
-
Title: Vga Box For Xbox
Post by: zeal on October 22, 2005, 04:32:00 AM
-
Post by: akram on October 20, 2005, 12:37:00 PM
Im form spain.
THX
Post by: DarkLegion on October 21, 2005, 04:11:00 PM
Seems to require very little external parts and includes sync seperation built in and even VGA passthrough if needed.
Post by: zeal on October 22, 2005, 04:32:00 AM
QUOTE(DarkLegion @ Oct 22 2005, 12:22 AM)
You guys looking to build a transcoder might want to take a look at a chip made by National here: http://www.national....LM/LMH1251.html
-
Title: Vga Box For Xbox
Post by: DarkLegion on October 22, 2005, 04:52:00 PM
-
No, but National offer free samples (although they charge for shipping these days).They also sell the part for only a few USD each.
-
Title: Vga Box For Xbox
Post by: tareqsattar on October 24, 2005, 12:20:00 AM
-
I'm thinking of buying a vga box in a few days..so far from what I gather the vdigi and x2vga boxes are pretty widely used with proven results. Is there any box or solution that gives me hdtv resolution and a way to hook up my tv cable with it ? I am probably gonna get a 21 inch or higher monitor and a vga box to switch between tv and my xbox games in hd but i dont think vdigi and x2vga have inputs for tv cable...
-
Title: Vga Box For Xbox
Post by: The Zep Man on October 24, 2005, 04:20:00 AM
-
Post by: DarkLegion on October 22, 2005, 04:52:00 PM
Post by: tareqsattar on October 24, 2005, 12:20:00 AM
Post by: The Zep Man on October 24, 2005, 04:20:00 AM
QUOTE(Foe-hammer @ Oct 19 2005, 07:57 AM)
Since this was bumped, i'll reply.
-
Title: Vga Box For Xbox
Post by: Foe-hammer on October 25, 2005, 02:15:00 AM
-
Post by: Foe-hammer on October 25, 2005, 02:15:00 AM
QUOTE(The Zep Man @ Oct 24 2005, 04:31 AM)
You give a lot information which is simply untrue/incomplete.
-
Title: Vga Box For Xbox
Post by: BBABBA76 on October 28, 2005, 08:43:00 PM
-
My monitor are an LG 795 FT+ and it support 1600x1200 at 75Hz and should be able to work with 720p.
Anyone know the solution of my problem?
Thanks, Angelo
PS: Sorry for my poor english
-
Title: Vga Box For Xbox
Post by: Chad N. on November 01, 2005, 08:03:00 PM
-
I think the reason a lot of monitors are not working with the 720P and 1080i resolutions, is that the monitors do not support the 16:9 aspect ratio.
Many monitors can handle high resolutions. They just don't know what to do with a resolution in a 16:9 format. They were only designed to have a 4:3 input.
And yes, I know if you watch a movie on your PC in a 16:9 format, the monitor displays it. However, the video card is actually outputting a 4:3 signal with black bars at the top and bottom.
-
Title: Vga Box For Xbox
Post by: Foe-hammer on November 02, 2005, 04:31:00 PM
-
Post by: BBABBA76 on October 28, 2005, 08:43:00 PM
My monitor are an LG 795 FT+ and it support 1600x1200 at 75Hz and should be able to work with 720p.
Anyone know the solution of my problem?
Thanks, Angelo
PS: Sorry for my poor english
Post by: Chad N. on November 01, 2005, 08:03:00 PM
Many monitors can handle high resolutions. They just don't know what to do with a resolution in a 16:9 format. They were only designed to have a 4:3 input.
And yes, I know if you watch a movie on your PC in a 16:9 format, the monitor displays it. However, the video card is actually outputting a 4:3 signal with black bars at the top and bottom.
Post by: Foe-hammer on November 02, 2005, 04:31:00 PM
QUOTE(Chad N. @ Nov 1 2005, 09:14 PM)
I think the reason a lot of monitors are not working with the 720P and 1080i resolutions, is that the monitors do not support the 16:9 aspect ratio.
-
Title: Vga Box For Xbox
Post by: BBABBA76 on November 03, 2005, 05:28:00 AM
-
Post by: BBABBA76 on November 03, 2005, 05:28:00 AM
QUOTE(Chad N. @ Nov 2 2005, 06:14 AM)
I think the reason a lot of monitors are not working with the 720P and 1080i resolutions, is that the monitors do not support the 16:9 aspect ratio.
-
Title: Vga Box For Xbox
Post by: Chad N. on November 03, 2005, 11:57:00 AM
-
-
Title: Vga Box For Xbox
Post by: DarkLegion on November 03, 2005, 08:03:00 PM
-
My 1989 14" Mitsubishi monitor which only barely does 800x600 (but syncs down to 480i), can handle 1080i The odd resolution could certainly confuse some monitors if they are not good at handling non standard resolutions and syncs i.e a "picky" monitor.It could also be because of the the tri-level sync in 720p/1080i which usually results in a purple image but a "picky" monitor might reject it entirely because of the positive going pulses.
-
Title: Vga Box For Xbox
Post by: Foe-hammer on November 03, 2005, 11:06:00 PM
-
Post by: Chad N. on November 03, 2005, 11:57:00 AM
QUOTE(Foe-hammer @ Nov 3 2005, 01:42 AM)
Post by: DarkLegion on November 03, 2005, 08:03:00 PM
The odd resolution could certainly confuse some monitors if they are not good at handling non standard resolutions and syncs i.e a "picky" monitor.It could also be because of the the tri-level sync in 720p/1080i which usually results in a purple image but a "picky" monitor might reject it entirely because of the positive going pulses.Post by: Foe-hammer on November 03, 2005, 11:06:00 PM
QUOTE(BBABBA76 @ Nov 3 2005, 05:35 AM)
Then why I succeed to view a DVD video in 480p with black bars at the top and bottom with DVDRegionX patched?
-
Title: Vga Box For Xbox
Post by: Textbook on January 05, 2006, 12:13:00 AM
-
Bumping this because I think it's a cool project. I may end up doing this if I could just get new, updated, clear schematics. That's all I'm asking. There is a lot of talk on here about the Max 4383 and the LMH1251 ICs, but these are not shown in Ken Gasper's Schematic. If anybody has a newer schematic, using the updated ICs, I would highly appreciate a reply to this topic, a friendly PM, or an email. I will even host them for everybody to see.
-
Title: Vga Box For Xbox
Post by: b u L L on March 16, 2006, 08:38:00 AM
-
I'm hoping somebody can post a link to Gasper's schematic, also.
I may just end up buying one, but I'd still like to try building one just for fun.
-
Title: Vga Box For Xbox
Post by: thecowsays on March 16, 2006, 05:58:00 PM
-
i have the scematics for those who want em
send an email to [email protected] and pm me so i know to check that email address
ill send em to whoever or if somebody wants to host em that works too
-
Title: Vga Box For Xbox
Post by: thecowsays on March 16, 2006, 09:24:00 PM
-
so i emailed the schematics to textbook and hes going to host them. its pretty involved and would be easiest if somebody had a custom pcb made. I got it all put together but it didnt work. but i just looked at it again and some of my soldering is shitty, and i didnt really try to get it to work.
heres a part list (all are 1%)
resistors (ohms):
1.02k x 1
698 x 1
2k x 3
511 x 1
75 x 3
931 x 1
1.78k x 1
1.3k x 1
2.8k x 1
1.05k x 1
549 x 1
442 x 1
5.76k x 1
86.6 x 1
80.6 x 2
4.99k x 4
340k x 1 ?
887 x 1
10 x 2
680k x 1 ?
capacitors
0.1uF x 4
330 pF x 1
chips:
max4383
LM1881
everything is available at mouser.com and you can get the chips for free by requesting a free sample from the manufacturer
edit:
looking back at page 2 there are some good links, also the 340k resistor may need to be replaced by the 680k, id say order both and give it a try.
-
Title: Vga Box For Xbox
Post by: Textbook on March 16, 2006, 09:27:00 PM
-
And here is the link to the updated schematics that I have been waiting for for so long. Thanks to thecowsays. Hope everybody can now have a chance to try out these updated schematics, as they look a lot better than the old ones. And a lot easier too. So click here, start ordering, and start soldering. I know I will try this when I get a chance. Hopefully somebody will get this to work. Click, Click.
-
Title: Vga Box For Xbox
Post by: thecowsays on March 16, 2006, 10:43:00 PM
-
this is getting to be more expensive than i thought.
found everything on mouser.com
most resistors are available as 1/4 watt 1% i had to get a couple as 1/8 watt which are quite a bit more expensive or have to be bought in quatities of hundreds.
you can do surface mount, but they are a pain to work with, but are also pretty cheap.
the capacitors are only available as 5% unless you want to buy a couple hundred at over a dollar apiece
anyway parts with extras were $5.91 shipping is $5.85 im going to get the adapter on page 2 of this post which ends up being $7.80 after shipping. All of that stuff is just under $20. I got the chips for free and i have yet to order the vga plug and the board, neither of which are expensive. Looking on radio shack and mouser, the board will be $2-3 and the vga plug will be $2.20 -> here
so total parts ends up under $25.
-
Title: Vga Box For Xbox
Post by: Textbook on March 17, 2006, 12:28:00 PM
-
Hey, just got a question about a couple connectors. I was wondering if there is anything specific about Component connectors/jacks, or are they the same as RCA/Composite. I would like to buy a 3-plug connector that could be soldered onto the board so that this could be used with more than just my Xbox. Anybody know where to find one of them? Besides ripping it off of an old TV. I think it's labeled as HEADER6 in the schematic.
-
Title: Vga Box For Xbox
Post by: thecowsays on March 17, 2006, 02:38:00 PM
-
so i realized that the vga plug i linked to in my previous post is out of stock and wont be in for 10 weeks
here is a new one.
textbook: rca = phono = component = composite as far as the plug itself is concerned. if you want the right colors for component you have a long search ahead of you. i found em somewhere but for some reason its hard ot find red/green/blue rca jacks. it was probably close to 2 years ago, so i forget where i got em, sorry i cant be of more help, but theyre out there somewhere!
-
Title: Vga Box For Xbox
Post by: Elite786 on April 15, 2006, 02:56:00 PM
-
Hi guys, did anyone successfully build the circuit and get it to work?
ive just gone out and bought the lm1881n and then after 20hours of extra reading i found this thread.
tthings look optomistic judging by the response.
Thanks to everyone been helping out with the project.
Post by: Textbook on January 05, 2006, 12:13:00 AM
Post by: b u L L on March 16, 2006, 08:38:00 AM
I may just end up buying one, but I'd still like to try building one just for fun.
Post by: thecowsays on March 16, 2006, 05:58:00 PM
send an email to [email protected] and pm me so i know to check that email address
ill send em to whoever or if somebody wants to host em that works too
Post by: thecowsays on March 16, 2006, 09:24:00 PM
heres a part list (all are 1%)
resistors (ohms):
1.02k x 1
698 x 1
2k x 3
511 x 1
75 x 3
931 x 1
1.78k x 1
1.3k x 1
2.8k x 1
1.05k x 1
549 x 1
442 x 1
5.76k x 1
86.6 x 1
80.6 x 2
4.99k x 4
340k x 1 ?
887 x 1
10 x 2
680k x 1 ?
capacitors
0.1uF x 4
330 pF x 1
chips:
max4383
LM1881
everything is available at mouser.com and you can get the chips for free by requesting a free sample from the manufacturer
edit:
looking back at page 2 there are some good links, also the 340k resistor may need to be replaced by the 680k, id say order both and give it a try.
Post by: Textbook on March 16, 2006, 09:27:00 PM
Post by: thecowsays on March 16, 2006, 10:43:00 PM
found everything on mouser.com
most resistors are available as 1/4 watt 1% i had to get a couple as 1/8 watt which are quite a bit more expensive or have to be bought in quatities of hundreds.
you can do surface mount, but they are a pain to work with, but are also pretty cheap.
the capacitors are only available as 5% unless you want to buy a couple hundred at over a dollar apiece
anyway parts with extras were $5.91 shipping is $5.85 im going to get the adapter on page 2 of this post which ends up being $7.80 after shipping. All of that stuff is just under $20. I got the chips for free and i have yet to order the vga plug and the board, neither of which are expensive. Looking on radio shack and mouser, the board will be $2-3 and the vga plug will be $2.20 -> here
so total parts ends up under $25.
Post by: Textbook on March 17, 2006, 12:28:00 PM
Post by: thecowsays on March 17, 2006, 02:38:00 PM
here is a new one.
textbook: rca = phono = component = composite as far as the plug itself is concerned. if you want the right colors for component you have a long search ahead of you. i found em somewhere but for some reason its hard ot find red/green/blue rca jacks. it was probably close to 2 years ago, so i forget where i got em, sorry i cant be of more help, but theyre out there somewhere!
Post by: Elite786 on April 15, 2006, 02:56:00 PM
ive just gone out and bought the lm1881n and then after 20hours of extra reading i found this thread.
tthings look optomistic judging by the response.
Thanks to everyone been helping out with the project.