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/diy/ - Do It Yourself

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1280787 No.1280787 [Reply] [Original]

Does anyone know where I can get this Chroma/QAM demodulator/decoder chip or a cohesive schematic for one I can make.

>> No.1281040

>>1280787
I might be misunderstanding you... You want a single chip solution that can take a digital QAM signal and output analog svideo? I don't think that exists. Most (all?) QAM demodulaters output MPEG streams. Since QAM can be a number of different resolutions you'll need another chip to transcode/transsizing the stream to 480i. Finally you'd need a chip to take the MPEG stream and output analog svideo. If you're lucky the transcoder will have an analog output that you can convert to svideo.

>> No.1281057

>>1281040
Well, my goal is just to convert the modulated chroma signal from either s video or the chroma separated from composite to U(B-Y) and V(R-Y) compatible with Component video. I want be able to build this on my breadboard.

>> No.1281061

>>1281040
I am talking purely analog, no digital.

>> No.1281090

>>1281061
Took some digging but I believe you're looking for a NTE705a. It decodes svideo's chroma signal and output B-Y and R-Y.

http://www.nteinc.com/specs/700to799/pdf/nte705a.pdf

>> No.1281095

>>1281090
That's what I'm looking for. I just need to hunt down the schematic for it.

>> No.1281115

>>1281095
Here's another more complex but complete solution. The datasheet even has a schematic.

https://www.promelec.ru/pdf/M52016SP.pdf

>> No.1281130

>>1281115
Holy shit, this just might be what I'm looking for. thanks anon.

>> No.1281132

>>1281130
You're welcome.