[cbob]

Oh, sorry, Michael, I do not want to waste your time – I thought that here were more users of this circuit who could answer questions, not only you. And furthermore I thought it was okay to ask here as the whole project has a taste of some kind of “open*” stuff…

And thanks for your time again.

[cbob]

I’ve tried 3 different video cams, all with the same result.
Nothing changes if I adjust the potentiometer.
And no, I’ve bought all parts separately with your schematics as base – for R4 I’ve tested different potentiometers as I could not find a value for this. But many different sources on the internet say that it should not be necessary and they work with the 680k only. So do you think, it is necessary?

My idea is, that something is wrong with the lm1881 because if I look at the oscilloscope output from syncout I recognize too many spikes between the “normal” impulses. What do you think?

[cbob]

Hm, I checked the signal directly at the pins of the arduino (tested now with an UNO)
The *-0001.png is taken from pin8
and the *-0002.png is taken from pin2

Maybe the syncout is not in the right shape? I dont know how it has to be. Maybe the 1881 is broken?

[cbob]

Hello Michael!

Yes, I’m in PAL country and I have a PAL video source 😉
I soldered it by myself and I have an arduino mini not an UNO but taking account of the datasheets the ports should working as expected.
Where can I start to search?

Attached you can find a short video – first with sync from video input and the last seconds with sync from D9
OOps, attachments are not possible?!So here is the link to the video:
https://drive.google.com/file/d/0B7MPaRLM-PfcR1gxVTFKNG5NTjJpZURtLTFIYW51SkNJQWNJ/edit?usp=sharing

[Author]

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