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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Sun Feb 08, 2009 10:50 pm Post subject: Re: Cheap positive to negative sync converter |
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| Tom.W wrote: | | http://www.twobits.com/sync.html |
So this would go on the sync lines I take it? Would you need 2 one for Horizontal one for vertical?
What about composite video or Sync on green?
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Mon Feb 09, 2009 2:40 am Post subject: |
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Or you can buy an Extron box off ebay for $5. ... Or from me, I've got a half dozen of them kicking around...
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Mon Feb 09, 2009 5:34 am Post subject: |
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| kal wrote: | Yup. This'll work. The only issue is that by the time you put a couple of the 10 cent IC's on a board, add 4 BNC connectors, a power supply, and box, you're up to at least $40-50 or so. Not to mention the time wiring it up. I'd rather just spend an extra $40-50 and use a BUF2000 or GammaX and get gamma boost for the extra money as all CRT displays require some form of gamma boost to get a reasonable image quality (ie: gamma betwen 2.2 and 2.5).
Links:
http://www.curtpalme.com/BUF2000.shtm
http://www.curtpalme.com/GammaX.shtm
Kal |
Why not put the ICs in the PJ and pull the power for them from it? No box, no power supply, no BNC connectors...
No gamma, but if all you want is pos/neg sync change, that's the way to do it.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Mon Feb 09, 2009 5:42 am Post subject: |
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| jkruger wrote: | | kal wrote: | Yup. This'll work. The only issue is that by the time you put a couple of the 10 cent IC's on a board, add 4 BNC connectors, a power supply, and box, you're up to at least $40-50 or so. Not to mention the time wiring it up. I'd rather just spend an extra $40-50 and use a BUF2000 or GammaX and get gamma boost for the extra money as all CRT displays require some form of gamma boost to get a reasonable image quality (ie: gamma betwen 2.2 and 2.5).
Links:
http://www.curtpalme.com/BUF2000.shtm
http://www.curtpalme.com/GammaX.shtm
Kal |
Why not put the ICs in the PJ and pull the power for them from it? No box, no power supply, no BNC connectors...
No gamma, but if all you want is pos/neg sync change, that's the way to do it. |
Not a bad idea. That an a set of dip switches.
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Mon Feb 09, 2009 7:35 am Post subject: |
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Why the dip switches? If all you need to do is change an older Barco to positive sync, just put in the 7404's and go with it.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Mon Feb 09, 2009 9:30 am Post subject: |
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Well what if you decide to run a 1024x768 resolution in there from a lap top or something? Most of the time 1024x768 is negative sync. It's just nice to be able to switch it, just in case.
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