extracting H/V sync from sync-on-green video signal?

From: Jules Richardson <julesrichardsonuk_at_yahoo.co.uk>
Date: Mon Jan 31 06:51:15 2005

On Sun, 2005-01-30 at 21:08 -0500, der Mouse wrote:
> > I keep on finding sync combining circuits that'll do seperate sync to
> > sync on green everywhere, but nothing to do the reverse!
> I thought the right thing there was to simply connect the green output
> to both the green video input and the sync input.

Yes, I expected that to work too, but no luck here with the Tek
connected to my old 19" Sun 'goldfish bowl' screen (which was working
when I last used it a few years ago)

Unfortunately I don't have an LM1881 chip in the spares pile :-( I could
have sworn there was an easier way though (i.e. not using a 'custom'
chip) but digging through my saved schematics I can't find anything.

The 21" Iiyama screen on my desktop PC has both BNC and VGA inputs and
will do S-O-G of course, so I can still hook the Tek up that way - but
the machine's noisy as all hell, so it would have been nice to get it
into another room with its own display (and just telnet in to work on


Received on Mon Jan 31 2005 - 06:51:15 GMT

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