Chronicles of Ridick. I did some more messing around, not too much progress but some. One thing for sue is even the new longbows need some modifying, i need to first do the HVPS as there is back ground noise there that i don't have in my older marquee's that I did do the modification to. those carbon comp resistors are much noisier than the Ohmite ceramics.
Now on this one if you compare it to VPHG90's , its much darker, to match his i would have to raise brightness up to 80, mine is at 53. there is no way he has FFTB as even at 53 i do not.
Some more: I can't wait till they add gamma control to the C2-2xxx series. it help out a lot.
This is my Favorite of the bunch: I think the camera was able to focus the best on this one, thats one thing about auto focus, the depth of field of the image on the screen can trick the camera to where to focus.
Nice VP!!!, But what's your source? You need to adjust your timings to help get rid of the ringing on the left side. Or if you have room move the image over to give the beam time to calm down before the image scan. But MAN those colors look great!!!!
Athanasios
Ok athanasios in fact you were right for the ringing on the left side !!
I corrected the problem
Ringing for high scan rates is one of the hardest things for CRT's to overcome. You want to be able to keep the entire image but still give the beam enough time to calm down from its flyback. Increasing the back porch helps but you could run into the problem of cutting off some of the image.
Last night I made some changes to the Marquee that totally separated the VIM (video input module) from the projectors power rails. The VIM is now powered by two (+/-5v - +/-12v) very low noise power supplies now mounted on a small wooden board and setting on the top of the projector. Next I'll look at doing the same for the next boards.
The changes on this end are obvious, the image is extremely cleaner and even more dimensional. Gamma is disabled (removed) on the Moome card.
I can now see how terrible my lenses (HD-10L) are and will also look at the GT-17's again sometime soon.
Neither will I, or would I be doing anything to the 85 volt rail.
I have two small switching power supplies connected to the VIM and located on top of the Marquee near the mount. And that's as bizarre as it'll get for me.
The Linear supplies sound good for the VIM, but it's not the best way to go if you're trying to get around the LVPS in the projector.
I'm using two VERY clean and small dual switching power supplies and the end results is well worth whatever I went through to make it happen.
I bet if you did use linear on your moded Vims mike it be even better. Even the cleanest SMPS can have more noise than a well thought out linear supply from what i read.
I bet if you did use linear on your moded Vims mike it be even better. Even the cleanest SMPS can have more noise than a well thought out linear supply from what i read.
Athanasios
The weekend I'll fire up the scope and set up both probes at equal amplitude. From there I'll measure the load from an linear supply as well a one of the switching supplies I've mentioned.
I'll post a screen-shot showing the results. Linear should have lower noise, but that's not what I measured.