xbox on arcade monitor WORKING!

[truffelzwijn]

Here it is  

It took some tries to get it working.

1) Directly hook up the monitor to the RGB scart cable using the composite video as C-sync signa. This did produce an image but was way too dark.

2) Used the video amplifier from www.ultimarc.com. This did not work until i removed the capacitors of the scart cable. It then produced a fine image but with moving images the monitor would lose sync. I had expected this a little since the monitor requires a sync signal of 1.5V and the xbox does not produce this.




3) Using a LM1881 circuit i stripped and amplified the sync signal and fed this directly to the monitor, bypassing the video amplifier. Somehow the amplifier did not pass the sync through properly and this would result in the monitor losing sync every 3 seconds or so.




This worked great and although i still need to fiddle around with all the control to get the best image quality. I am very happy with the result.

I mounted the two boards 'ghetto' style on a piece of wood and this is screwed on the inside of the cabinet.







I wouldn't have been able to do this without this without your help. Thank you all  

[Anonymously]

 
Great news indeed.  I also notice some slight darkness with my monitor, but I thought that was just my monitor, because I seem to have the same result when I use my monitor with my ArcadeVGA.  I just want to know if I understand this correct, " By amplifiying the sync signal will gives you a much brighter picture?"  I didn't want to use the LM1881 chip, due to I'm not very familiar with electronic device and I just learning this as I go.

[truffelzwijn]

Actually the lm1881 didn't do anything for the image brightness. The problem was that without it the monitor would lose sync on moving images. Stationary was fine but as soon as large objects moved the monitor would lose sync for a second.

Have you checked all the potmeters on your monitor? Brightness, contrast?

[dhansen]

Looks cool, I have two more Ultimarc video brightners for sale at the Buy/Sell/Trade board if anyone is interested!

Doug