Author Topic: [RESOLVED!!!] Arduino UNO COLOUR NTSC Output with AD725 - Bad colours issue...  (Read 1143 times)

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Offline Axxel

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Re: Arduino UNO COLOUR NTSC Output with AD725 - Bad colours issue...
« Reply #25 on: October 04, 2019, 06:19:57 pm »
I tried with real VGA Signal output form my laptop: (1024 x 768 @ 60Hz) - I also tried 800x600 but it's worst. We can't distingate the picture.





On the CRT TV, the image moves up to down it is worst.



Now I used the Arduino with library VGAX with the pattern example:



LCD:



CRT:



I have exactly the same results with AD724 and AD725...
 

Offline amyk

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Re: Arduino UNO COLOUR NTSC Output with AD725 - Bad colours issue...
« Reply #26 on: October 04, 2019, 08:08:53 pm »
Look at the input signal with the scope, and confirm whether it matches what you expect.
 

Offline StillTrying

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Re: Arduino UNO COLOUR NTSC Output with AD725 - Bad colours issue...
« Reply #27 on: October 04, 2019, 09:29:14 pm »
There seem to have been others getting the wrong colours out of AD724s and AD725s, this one says.

Solution: The width of the HSYNC signal was 6 us, out of spec of 2.8 ... 5.3 us for AD725.
https://electronics.stackexchange.com/questions/442310/ad725arz-wrong-colors

May be worth looking at the exact width of the HSYNC.
CML+  That took much longer than I thought it would.
 

Offline Axxel

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Re: Arduino UNO COLOUR NTSC Output with AD725 - Bad colours issue...
« Reply #28 on: October 05, 2019, 06:18:14 am »
Sorry, but trying to do this on a breadboard is simply utopic. Try a stripboard with short interconnects.

Here was the problem, the cable to the 4OSC pin when I move it, the colours changes.

I shorted this cable as much as posible and here we go!





Thank you very much at everybody here  :-+ :-+ :-+
 
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