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Television Standards Converters, Modulators etc Standards converters, modulators anything else for providing signals to vintage televisions.

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Old 18th Nov 2006, 10:48 pm   #1
jim_beacon
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Default EPE RGB to YUV adaptor

spotted an article in the latest EPE magazine, describing an RGB to YUV adaptor, with added on synch. I's a nice simple device, and may be of interest to FOTH experimenters (especially the fact that one output is effectivly RGB combined to give a monochrome luminance signal).

Jim.
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Old 18th Nov 2006, 11:27 pm   #2
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Default Re: EPE RGB to YUV adaptor

Can you provide a link so that I can take a look.

Cheers,

Steve P
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Old 18th Nov 2006, 11:59 pm   #3
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Default Re: EPE RGB to YUV adaptor

unfortunatly not, we had a copy at work, which is where I saw it, but as it is the current issue, I can't scan it, the best I can do is this:

http://www.epemag.wimborne.co.uk/1206.htm

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Old 19th Nov 2006, 8:49 am   #4
Mike Phelan
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Default Re: EPE RGB to YUV adaptor

Without the sync or any other bits, RGB to YUV is just a matter of maths and resistors. Reverse of a TV with RGB drive.
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Old 19th Nov 2006, 10:43 am   #5
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Default Re: EPE RGB to YUV adaptor

Mike,

you're quite correct, but this is a simple, publshed design, which will give composite video from RGB, and includes a modification to add synch.

I'm holding it up as a basis for further experimentation, especially considering earlier discussions about using op-amp combiners with the FOTH project.

Jim.
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Old 5th Dec 2006, 9:03 pm   #6
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Default Re: EPE RGB to YUV adaptor

Hi,

Just picked up a copy of EPE today and got a feeling of deja-vu; the device described therein is this one which I'd found online earlier in the year.

Strangely I'd managed to read the full article on-line free a few months ago, now it seems to want money...

It's one I'd considered basing something on; partly what's needed for FotH TV is an RGB to Y/Cr/Cb converter with the Cr/Cb bits missing.

It still needs H + V sync combining correctly then adding to the Y, though. I might managed to get back into this next year if other things stop getting in the way.

Cheers, Kat
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Old 6th Dec 2006, 10:13 am   #7
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Default Re: EPE RGB to YUV adaptor

A lot of the more popular Silicon Chip projects end up as kitsets from Dick Smith or Jaycar eventually - unfortunately it doesn't look like this one has (yet) but its worthwhile keeping an eye out in case it does.
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Old 6th Dec 2006, 1:10 pm   #8
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Default Re: EPE RGB to YUV adaptor

Have just boudgt the mag - Im not too sure if this will be much use, but might have a go at it anyway..... (it is much neater than the one I am building....)

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Sean
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Old 8th Dec 2006, 2:17 am   #9
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Default Re: EPE RGB to YUV adaptor

There is an even cheaper route to converting RGB to YUV for feeding converters and the like: most half decent DVD players and recorders have component out. Just make sure in the menu the output is set up for interlace rather than progressive. I used the Y output successfulyfor my Aurora from a Panasonic DVD recorder which in turn was connected to a DTT box by RGB scart.
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Old 8th Dec 2006, 2:34 am   #10
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Default Re: EPE RGB to YUV adaptor

Hi,

I'm not sure a 625-line DVD recorder would cope too well converting 405-line, 819-line (or anything else) RGB to component, though - which is what we're attempting to do.

Just to clarify, the FotH TV system outputs DVD, off-air TV, timeshifted hard disk recordings or whatever as 405-line (or 819-line, 240-line, 441-line etc.) 0.7V p-p RGB video plus separate TTL-level horizontal and vertical sync. This needs combining to feed a modulator - no conversion, it's already the right standard but it's RGB.

The EPE circuit does some of what's needed (and isn't standard specific); I think it's a good basis for further experimentation.

Cheers, Kat
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Old 9th Dec 2006, 10:37 pm   #11
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Default Re: EPE RGB to YUV adaptor

Just ordereed some "samples" - so might have a spare set of chips begging soon!

Cheers
Sean
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Old 14th Dec 2006, 2:08 pm   #12
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Default Re: EPE RGB to YUV adaptor

A couple of spare ICs here now........

I will order a PCB soonish, and build this unit

Cheers
Sean
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