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FleaUNO NTSC DAC
08-07-2019, 07:51 AM
Post: #1
FleaUNO NTSC DAC
Hope you don't mind me posting a question about a product that's long past it's expiry date, but Uno is still one of my favourite toys and I'm still developing with it.

So one quick question: is there any trick to getting the NTSC DAC working? If I generate a signal using my own resistor ladder then it works fine, but if I do it through the AV cable I get spiking that looks like there's capacitor in parallel to the load. Sure enough, when I look at the schematic I see C47, but it's marked DNF and I can't locate it on the board either:

[Image: D1hMzdv.png]

My constraint file uses the locations from the sample app:

LOCATE COMP "NTSC_DAC[3]" SITE "27" ;
LOCATE COMP "NTSC_DAC[2]" SITE "28" ;
LOCATE COMP "NTSC_DAC[1]" SITE "143" ;
LOCATE COMP "NTSC_DAC[0]" SITE "31" ;

I haven't ruled out the possibility that I've somehow borked my DAC pins, but I can't help but feel there's something I'm missing?
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FleaUNO NTSC DAC - Myndale - 08-07-2019 07:51 AM
RE: FleaUNO NTSC DAC - Fleasystems - 08-12-2019, 12:54 PM
RE: FleaUNO NTSC DAC - Myndale - 08-12-2019, 04:36 PM

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