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WTS
Joined: 08 Mar 2006
Posts: 1276
Location: Calgary
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| Posted: Thu May 21, 2009 6:34 pm Post subject: |
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HI Mike,
The mods I did were mainly the (whole) supply circuitry which to me was sub-standard and I discussed that with Moome. I haven't seen if he has changed it to my recommendations but he did say he thought it was a good idea. It's been a while so I don't recall off hand what the output opamps are but I can't reveal that info (part numbers) anyways. And I don't know exactly what his release versions were named but I beleive it was ver 1.3.
No there is no removable Gamma board on the latest versions. This was one thing I discussed with Moome as I didn't think it was a good idea. Also on the subject of the gamma circuit I had discussed ways of maintaining the 0.7vpp output level while setting up the gamma boost so as to not blow out the whites, which Moome now has incorporated into the new board. I also came up with another circuit for setting up the gamma boost which would allow much easier setup but I don't beleive he has incorporated it yet, maybe in his next version. People have to realize that it costs alot and takes alot of work to redo a board like this and then send it off for processing and having new boards made up.
Yes I do have an external style board minus the case etc.
Yes there were a few layout versions required to fix some minut problems I could see and yes I did test it at 1080P but of course my CRT isn't as revealing as a modded out 9"er (MP) but it's close I'm sure.
_________________
Thanks
Walter
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Thu May 21, 2009 7:14 pm Post subject: |
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| WTS wrote: | HI Mike,
The mods I did were mainly the (whole) supply circuitry which to me was sub-standard and I discussed that with Moome. I haven't seen if he has changed it to my recommendations but he did say he thought it was a good idea. |
Not sure what board you're talking about, because he has already a second option for a PWM supply right on the board. He's using the passive supply, which checks out very well. And this particular board, unlike the previous version is well filtered and decoupled. He's also using inductors and tants this time. One of the things I was adding to the previous board.
It's been a while so I don't recall off hand what the output opamps are but I can't reveal that info (part numbers) anyways. And I don't know exactly what his release versions were named but I beleive it was ver 1.3.[/quote]
I have the 1.3, but there's no need to mention the op amps, because almost any of the newer chips there would do well below 1080P.
| Quote: | | No there is no removable Gamma board on the latest versions. This was one thing I discussed with Moome as I didn't think it was a good idea. Also on the subject of the gamma circuit I had discussed ways of maintaining the 0.7vpp output level while setting up the gamma boost so as to not blow out the whites, which Moome now has incorporated into the new board. I also came up with another circuit for setting up the gamma boost which would allow much easier setup but I don't beleive he has incorporated it yet, maybe in his next version. People have to realize that it costs alot and takes alot of work to redo a board like this and then send it off for processing and having new boards made up |
I can understand why he would have went the way he did in this design. he's doing everything in the DAC's it appears. And that would be better than having a second board floating on a digital noise bed. There's also some things to consider once that board is installed in the projector.
| Quote: | | Yes there were a few layout versions required to fix some minut problems I could see and yes I did test it at 1080P but of course my CRT isn't as revealing as a modded out 9"er (MP) but it's close I'm sure. |
Trust me on this, there's absolutely nothing you can do to the neck boards in your Cine 8 that would make it close to what I have in my Marquee. if you're able to get more than 100Mhz true bandwidth out of those chips, you're really good. being able to get them to exceed that is not going to happen. It may appear so, but it's not really possible. The 120mhz rating is a stretch, or more like hyped based on how they did the testing. That's not always going to be the case depending on the circuit it's being used in.
The Marquee neck board design uses discrete RF output transistors and IC's. because the 6 finals (2 drivers / 4 outputs) are Motorola High Frequency RF transistors, a limit was not in place.
Why don't you get a camera, or simply prove what you're saying with the test patterns. It's real easy for me, and I can even go beyond 1080P 72hz..
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WTS
Joined: 08 Mar 2006
Posts: 1276
Location: Calgary
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| Posted: Thu May 21, 2009 11:32 pm Post subject: |
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HI Mike,
The problem with the supply was the PWM circuit which was changed to the linear one after I had talked with him about it, much better with the linear supply and the extra tidbits.
I couldn't agree with more about the neck boards, I'd take a set of the marquee boards over what I have in the Cine8 anyday. But that's not going to happen so I'll just have to live with what's in there.
True enough that there are lots of opamps that will do 1080p, but some have a soft touch to them compared to others which is not just a BW problem. Personally I think the ones that are in the latest version are of the soft variety. Much to my dismay he decided to go with that one due to availability/cost.
Mike I don't doubt what you say about your PJ going beyond 1080p/72. Can you do that with the fury2?
I have an old Canon digital which isn't all that great anymore, the picture quality from it is degrading fast, and I'm in no hurry or need to buy another. For sure not to buy another just to post some screen pictures. Hell this camera gets used maybe a couple times a year if that. Besides that I'm not into to having to prove anything as far as my pj goes as I don't see this as a contest. Or is it?
Just out of curiosity, what test patterns are using and from what test disc?
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Thanks
Walter
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WTS
Joined: 08 Mar 2006
Posts: 1276
Location: Calgary
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| Posted: Fri May 22, 2009 6:45 pm Post subject: |
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Hi Mike,
Hmmm, I just reread the last part of your last post. It just seems odd that you're preaching about needing extra BW when your choice of video opamps only has -.1db spec of 50Mhz and rolls off quite quickly after that. Not to mention you use them in every circuit in your setup including your Marquee video chain. 
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Thanks
Walter
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