CurtPalme.com Home Theater Forum

**AnalogRocks** · Posted: Sat Jan 26, 2008 3:22 pm Post subject:

beun · Joined: 28 Jun 2006 Posts: 676

OK, the RTC2x00 output uses an exact 75Ohm termination and has the currrent capability to drive long cables.

beachbunnyfl · Joined: 12 Sep 2007 Posts: 27 Location: Seminole, FL

I am interested in this gamma dongle idea as well.
I was thinking of adding Kim's RTC2200 to my setup,
an HDMI switching receiver to HDFURY to Nec XG110.
This gamma booster would be perfect!
I do not need component inputs and I already
have a 35 foot HDMI run , w/ Monoprice HDMI booster,
working fine to the HDFURY.
The RTC2200 would mean pulling out the VGA-BNC cables again!
Please put me in the waiting line to buy one of these!
Robin

beun · Joined: 28 Jun 2006 Posts: 676

I already have a preliminary board layout ready and am waiting on a few sample dongles to see if I can make everything fit.

Tom.W · Joined: 09 Mar 2006 Posts: 6635

I have both tse's and beun's gamma cards. Both are very good ! Beun has adjustable gamma on his. Both seem to be a great upgrade for a CRT projector. Only beun has a model in production...

e_patsellis · Joined: 10 Jul 2007 Posts: 8

buen,
I'd be interested in a pcb or completed product, preference being to the pcb...

erie

stefuel · Posted: Wed Feb 13, 2008 3:27 am Post subject:

Probably a stupid question, but I'm good at that. Re the tse card, why do you even have to deal with sync. Why can't it just be passed? One more stupid question. Why does a doctor call what he does a practice? I don't want some dumb MF practicing on me Laughing

beun · Joined: 28 Jun 2006 Posts: 676

Well, I can only answer the first question. Since you need a known black reference when you want to do gamma you need the H-sync to clamp the signal to that known black reference. When you don't your gamma will depend on the average level of the video and that will look really weird.

Tom.W · Joined: 09 Mar 2006 Posts: 6635

Chip in answer to your second question it's for insurance reasons... Wink

**AnalogRocks** · Posted: Wed Feb 13, 2008 7:17 am Post subject:

stefuel · Posted: Wed Feb 13, 2008 10:58 am Post subject:

Tom.W · Joined: 09 Mar 2006 Posts: 6635

Was out of town for a three day holiday and now working on another major project with a deadline of friday but in the next couple days....

gcom007 · Posted: Fri Sep 05, 2008 5:28 am Post subject:

Is there any sort of updated schematic from those that have been posted? It sounded as if those posted were tentative while more definitive versions would be published later.

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

Elliot,

AVSGAMDCR_REVB.DSN

was the latest schematic. It was fully functional at that point. All the little bugs were worked out.

Scott

gcom007 · Posted: Sat Sep 06, 2008 1:16 am Post subject:

The reason I ask is this somewhat random thought of the possibility of somehow hard-wiring this into the projector signal path? I could likely only do it in the most rudimentary of ways, but I have electrical engineer friends who might have other ideas. But do you have any thoughts on this?

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

That is the whole idea. Connect your analog video signal into the device and connect its output to the input of your projector. The shadow details are then brought up from the mud and are displayed without setting the projector bright control too high. Something that benefits a CRT projector.

Scott

gcom007 · Posted: Sat Sep 06, 2008 5:50 am Post subject:

stefuel · Posted: Sat Sep 06, 2008 10:45 am Post subject:

I'm not saying it can't be done but it's a lot of work just for the sake of not seeing something outside the projector. You could use Scott's design, shrunk down to daughter board size and attach it to the RGB input card of your projector. Divert the signal from the input BNC's to the gama circuit then out and back to the input of the RGB input card. It would require a much smaller board with SMT construction.