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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Wed Oct 15, 2014 5:20 pm Post subject: Adverse effects of combining H and V sync? |
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I am planning to completely realign the living room, which means the projector would have to go up to the ceiling (at last). I am planning to save on cables and would combine the H/V sync cables, resulting in four upgoing cables instead of five, to my understandig that should not affect the picture quality at all. Am I right?
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Oct 15, 2014 6:40 pm Post subject: |
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No, no problems at all!
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Mon Nov 24, 2014 9:20 pm Post subject: |
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So, the projector is up on the ceiling, H and V cables tied together, so only 4 wires going up, it's not problem free. It only works if both sync polarity is the same. Fortunately my main resolution is +/+ but that's about it. My 3D dongle gets its sync from th V sync signal, it is not happy happy with the tied sync signals, it does not drive the glasses well.
I could build an active summing circuit for the syncs in the 3D dongle along with a sync inverting circuit, but what for? I'd better to pull in the fifth cable for separate sync...
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Tue Nov 25, 2014 12:45 am Post subject: |
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Yes, both syncs must be the same...
Wouldve certainly been easier to pull in 5 cables, and whiles youre at it pull in an HDMI cable too.
_________________
Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...
RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 7.1...
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Wed Nov 26, 2014 10:52 am Post subject: |
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| CasetheCorvetteman wrote: | Yes, both syncs must be the same...
Wouldve certainly been easier to pull in 5 cables, and whiles youre at it pull in an HDMI cable too. |
So guess What did I? 
I considered pulling in the fifth cable as a PITA because the cable I used was special and to match for the rest I would have to order more. While I looked up the google for circuit solutions I realized that all of them are far "over complicated" built off logic IC-s. I didn't have any of those desired ICs either. So I decided to build my own comp sync + invert circuit from what I have. It consist of three generic NPN transistors and a few resistors. It works.
| Description: |
| Composite sync "processor" + H sync inverting switch |
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57.5 KB |
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5401 Time(s) |
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_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Thu Nov 27, 2014 8:48 am Post subject: |
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Well done 
The LM1881 chip will probably work simular, its about $2 AUD for 5 of them last time i bought a bunch.
_________________
Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...
RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 7.1...
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umarsahb
Joined: 25 Mar 2015
Posts: 1
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| Posted: Wed Mar 25, 2015 9:52 am Post subject: |
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I am planning to completely realign the living room, which means the projector would have to go up to the ceiling (at last). I am planning to save on cables and would combine the H/V sync cables, resulting in four upgoing cables instead of five, to my understandig that should not affect the picture quality at all. Am I right?
_________________
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Wed Mar 25, 2015 11:01 am Post subject: |
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He when I look at the schematic there is a 5 V on the top? Where did you get that from? PC?
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701s->runco933->8500ultra->cinemax->9500mp->919 splitpack + cinemax
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Wed Mar 25, 2015 6:13 pm Post subject: |
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| redfox001 wrote: | | He when I look at the schematic there is a 5 V on the top? Where did you get that from? PC? |
Most (modern) videocards sends out 5V on Pin 9 on the d-sub connector, that was originally a dummy leg.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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