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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 1:31 pm Post subject: |
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No it also happened to Wolfman and I wonder why we never see smpte from greg1292? In fact we only see Strid with his set of high bandwidth neckboards a special set. Using a pattern generator straight into the neckboards.
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Last edited by redfox001 on Sun Feb 21, 2016 1:35 pm; edited 1 time in total
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 1:32 pm Post subject: |
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| the dude wrote: | | Quote: | | what you've been told on this. |
I've been told nothing by no one. I just can read circuit diagrams and have "a little" understanding on electronics.
| Quote: | | And what is the ARC reference to? |
This is because i suspect a arc destroyed the transistors, therefore they became conductive. |
Ok thanks. That explains.
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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: Sun Feb 21, 2016 1:39 pm Post subject: |
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| the dude wrote: | | Quote: | | what you've been told on this. |
I've been told nothing by no one. I just can read circuit diagrams and have "a little" understanding on electronics |
You do understand what the word "little" really means don't you. And you also understand that "a little understanding" is not enough to speak authoritative on any subject, especially electronics (where is the science)
| Quote: | | And what is the ARC reference to? |
This is because i suspect a arc destroyed the transistors, therefore they became conductive.[/quote]
So simply because you "suspect" something is the reason for failure, you're comfortable with stating it as though FACT.
Again, if over 10 years of these boards NOT having transistors fail, and then there is only ONE case reported...but again, who confirmed this and how was it done. Taking there should always be some science in what we do. Why do you keep throwing out assumptions, what you suspect and going by what someone tells you when there is no evidence to support their accusations, to include the abundance of evidence that support my claim. You think I would still be removing the diodes if I knew of ONE situation where a transistor failed?
This guy damaged those boards. he admitted to damaging the boards...he apologized for damaging the boards, and because he did not send them to me to be repaired but took it on himself to do it, well....
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 1:48 pm Post subject: |
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| mp20748 wrote: | | the dude wrote: | | Quote: | | Balance is critical for for proper operation |
No, it isn't as long as the ABL can set correct black level. |
Man, you're something else here, how is it you can make such bold comment about a circuit you obviously have no experience with. Duid someone forget to tell you that THEORY is not always FACT.
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This was generally speaking on push/pull drives.
But since you know this projectors you are some kind of god and nobody can make a statement regarding these machines.
It does not matter if a circuit like the ABL sets blacklevel or if you have to turn a G2 pot for this or something else. For the aspect of the general principle of K-G1 push pull drives THIS IS ABSOLUTLY IRRELEVANT as long as you can reach cut off and get a stable black level.
But nice you told me this machines don't have ABL.
| Quote: | | The Marquee does not have ABL...and even if it did, it would not act as a balance control for those amplifiers. |
I think you don't understand complex circuits. Really. The G1 drive for instance can have any output voltage. -50V or +100V, IT DOES NOT MATTER. If it is defective it may have 0V. The only thing that is importend is that you can control the beam. There it no need for balancing anything. In TV sets and computer monitors the G1 is tied to -50V sometimes, barco 1209s and 909 sets it to 0V and the marquee, g70, g90 and barco 1209 circuits drives it active. Thats all fine.
The discussion is OVER for me. Everytime when we prove that you are wrong you try to discredit us personally. I don't play this any longer, it is pointless and does not help to archieve our goals.
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 1:57 pm Post subject: |
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This does remind me of him saying that he changed the resistor between the top and the bottom halve on the marquee (R95). He said it was a kind of crossover distortion that he corrected. It allways made me wonder a crossover distortion there? Think he did not get it but I am no expert either.
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 2:00 pm Post subject: |
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And allways that lie that i apologised for damage done please show me that email once just repeating a lie does not make it true. I do not recollect apologising. I do recollect ending discussions because Mike is never wrong even if he is.
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 2:02 pm Post subject: |
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| Quote: | | You do understand what the word "little" really means don't you. |
Yes i do. Do you have an idea of what quotation marks may mean in this context?
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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: Sun Feb 21, 2016 2:07 pm Post subject: |
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| the dude wrote: | | The discussion is OVER for me. Everytime when we prove that you are wrong you try to discredit us personally. I don't play this any longer, it is pointless and does not help to archieve our goals. |
How can you prove me wrong with YOUR THEORY against my actual proven facts and my 20 or more years experience with the projector first hand, when you have zero experience with it. You base your theory on "a little experience" and your assumptions are based on ABL circuits and how they may affect other stages you know of and that should apply globally and everywhere, when the Marquee does not use those not-for-todays-HD-peformance circuits.
And why should I listen to you when you made it clear you did not want to listen to me, when what you're TRYING to accomplish I have already done so and on many different projectors and other devices. You and the fox have been the only two to dispute what I have already accomplished so many times over more than several decades. I'm not the one here that's trying to make something happen, the fact that I have already made things happen should have had you asking me what to do.
For instance, I know what that Hybrid is, and have also already gone through that neck board. Ive even pointed out to you where the bottleneck is, but since I have no experience with getting these circuits to perform better you did not listen to me. And why you two keep trying to get me to prove that I know at I'm talking about when neither of you have anything to boast about.
I'm glad you're done with this, so now I can continue to post without you challenging everything I post.
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 2:20 pm Post subject: |
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| Quote: | | Ive even pointed out to you where the bottleneck is |
I said EOD, but this can't be left uncommented...
You mean the clamping Op amp? Is this some kind of joke? We have proven a flat response right at the input of the hybrid, and for sure at the output is more than -3db off after a single stage. And you will tell us changing the OPA will improve that??? Really? Even emitter peaking on the hybrid does not change anything. Maybe we should replace the video cables with monster cables, this might be usefull also (at least for somebody)... I already explained what must be done to bypass the limits. I understand that you never aimed at anything behind the amplifier board, this would require some decent skills and im not sure if i would be able to do add a g1 drive.
So, now:
E-O-D
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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: Sun Feb 21, 2016 2:42 pm Post subject: |
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| the dude wrote: | | Quote: | | Ive even pointed out to you where the bottleneck is |
I said EOD, but this can't be left uncommented...
You mean the clamping Op amp? Is this some kind of joke? We have proven a flat response right at the input of the hybrid, and for sure at the output is more than -3db off after a single stage. And you will tell us changing the OPA will improve that??? Really? Even emmiter peaking on the hybrid does not change anything. Maybe we should replace the video cables with monster cables, this might be usefull also (at least for somebody)... I already explained what must be done to bypass the limits. I understand that you never aimed at anything behind the amplifier board, this would require some decent skills and im not sure if i would be able to do add a g1 drive.
So, now:
E-O-D |
Ok, I sent one of those boards (and some here should remember that) to Scott at VDC, he evaluated it in his lab with his rig, that BTW, he sent to me and I now own what he was using. I had also made a trip down there and spent the day gaining even more on video chains and how to evaluate them better. And at that time, I had more than a month working on that 909 neck board (where some on here know about as well).
Now with what Scott himself had pointed out to me, I'm also a Barco Trained Partner.. I have two phone numbers of two of their engineers, and I have the personal cell phone of one of them. You see, some years back, I was the only board level repair for their boards (that's also known) here in the states.
So put this in your mind. The bottleneck and what that Hybrid really is, why it was used came directly from Barco.
And because of the later industry the 909 was used in, the ABL circuit should not have been a part of its design.
So yeah, unlike you, I spent a lot of time with it, and have involved others to arrive at what I had mentioned. So I'm not sure how you were able to measure greatness beyond that "limiting amp" when others found it to be a problem area.
And when the day comes when you can make improvement in any projectors performance, to include getting any of them to perform well up to 1920X1080P as I have so well done, it's only then that you can properly claim you know what you're talking about, because so far all you've done was blow smoke.
Decent skills. No, what say the rule should be decent results. That one I don't have to prove at all..
Last edited by mp20748 on Sun Feb 21, 2016 2:45 pm; edited 1 time in total
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 2:45 pm Post subject: |
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| Quote: | | and what that Hybrid really is |
Oh, i thought it is an cascode amplifier. But maybe its some kind of alien artefact.... huuh, tell us!
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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: Sun Feb 21, 2016 2:48 pm Post subject: |
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| the dude wrote: | | Quote: | | and what that Hybrid really is |
Oh, i thought it is an cascode amplifier. But maybe its some kind of alien artefact.... huuh, tell us! |
Wow.. so there is something you don't already know. Interesting, how is that possible... did your crystal ball stop working?
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 2:53 pm Post subject: |
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Please tell me... it looks like an amplifier, it acts like an amplifier but someone told you a secret... Please share that with us!
Can it be used for time traveling?
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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: Sun Feb 21, 2016 3:03 pm Post subject: |
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| the dude wrote: | Please tell me... it looks like an amplifier, it acts like an amplifier but someone told you a secret... Please share that with us!
Can it be used for time traveling? |
Absolutely.. it would be perfect for that!
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 4:07 pm Post subject: |
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It looks good but there is also some overshoot or interference at higher contrast. Only center focussed. I will try another vallue for L2. Yet it does not show bad in the picture and the marquee has a lot more streaking going on.
 Untitled by Radio Head, on Flickr
Somewhat lower contrast
 Untitled by Radio Head, on Flickr
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 4:14 pm Post subject: |
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At higher contrast some interference in this testpattern
 Untitled by Radio Head, on Flickr
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 4:16 pm Post subject: |
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This looks pretty good!
Is this 470nH and a 1:1 pattern in the upper fields?
Huh, i really need to order some inductors !
Last edited by the dude on Sun Feb 21, 2016 4:18 pm; edited 1 time in total
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 4:17 pm Post subject: |
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Maybe increasing the series resistor would help since this will lower the Q factor.
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 4:20 pm Post subject: |
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I will make another picture just to be sure of the small squares. Increasing the resistor that might be a better idea.
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 4:26 pm Post subject: |
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But there is a limit on the contrast. I think I could make some razor screenhots with this 
 Untitled by Radio Head, on Flickr
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