12XX DIY YPrPb input card... - AVS Forum
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post #1 of 19 Old 01-20-2010, 06:08 PM - Thread Starter
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Yes folks, it is possible, no transcoding neccesary. At 576P and 480P it looks a lot nicer than SVideo or Composite. Also beats spending silly amounts of money on a line doubler (wish I knew this trick when I had my first 1252!).

I couldn't get hold of a IFB-12 or IFB12A to get progressive scan into my 1252 here in Australia, so I decided to make my own based on instructions for getting an IFB12 to work, and the service manuals.

Its actually very basic. You could run unbuffered video directly from your DVD player, but I preferred to buffer the video with a MAX497 which is one of the few video grade opamps still available in DIP package (for ease of soldering/board design) but it uses a dual rail power supply, so you need to generate a negative supply rail. It is a bit thirsty at 30ma, but doable with a squarewave osciallator + caps + diodes on the 12V rail.

Sync is separated by an LM1881 (a GS4881 would be nicer, and is pin-for-pin compatible, but I had a LOT of trouble sourcing one - it does Tri level sync, but the 1881 only does BI level sync - keep this in mind).

Power is a single +12V rail, which is regulated to +5V for the LM1881 and positive rail of the MAX497, and is switched by the projector as the card is selected (0V is on, +5V is off), which also turns the isolation relays on and off as well.

An odd part of the design is the inclusion of a Medium logic level, which in the projector is generated by a 2.7V zener, but as these are hard to come by, a 3.3V zener fills this role adequately.

If anyone is interested, I can post up the schematic and PCB design, in case you would like to make your own.
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post #2 of 19 Old 01-20-2010, 07:51 PM
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Quote:
Originally Posted by heathyoung View Post

a GS4881 would be nicer, and is pin-for-pin compatible, but I had a LOT of trouble sourcing one

$2 on ebay:
http://cgi.ebay.com/ws/eBayISAPI.dll...m=220478324085
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post #3 of 19 Old 01-21-2010, 05:55 PM
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Please post up how you did it and a parts list please. Sounds like a cool project that i would be up for. If you have any images or diagrams please post those too. If not could you at least send me the info so I can see about doing one. Thanks and very cool!
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post #4 of 19 Old 01-25-2010, 08:26 PM
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PLEASE POST THIS INFORMATION!!!!

I'd love to build a component input for my 1272!

Rudy

"Contraversial not Commercial"
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post #5 of 19 Old 01-26-2010, 09:51 PM - Thread Starter
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I'm working on a PDF with all of the information etc. that I will post here, and send on to Curt Palme for his CRT website as well if he is interested to enable its furthur distribution.
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post #6 of 19 Old 02-02-2010, 10:09 PM - Thread Starter
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Sorry about the delay folks - I had a crash on my bike on the way to work last week and cracked a rib - ouch. But here it is - description, circuit diagram and PCB designs...

Have fun!

 

DIY IFB-12HY Progressive Scan Card.pdf 185.7275390625k . file
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post #7 of 19 Old 02-03-2010, 04:55 PM
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Dude very cool.
Few questions i have for you or the group here.
1) will this work with a sony 1251q?
2) can anyone put this together in a Eagle format so we can go have have it printed? Or does anyone want to take a run at it and sell the printed boards for DIY people like me?

I'm kinda pumped for putting this together. Other than the PCB board how much did the parts come to for cost? Seems to be it could be done pretty reasonably for cost if you can't find a real card.
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post #8 of 19 Old 02-03-2010, 05:38 PM - Thread Starter
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Yeah about that - I actually have a 1251Q (I thought it was a 1252, but it says it on the cover I misplaced in the garage.

Cost - Ummm... I think it ended up around about $45 AUD for all of the parts. I didn't buy it from the cheapest of suppliers, so shopping around should help reduce the cost.

The PCB was hand done with bits I normally have lying around, I used ExpressPCB (badly) to create the pcb, and used press'n'peel and ironed it onto the board. Easy and cheaper than a board house.
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post #9 of 19 Old 02-04-2010, 10:40 AM
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Sounds great about yours being a 1251Q! Should be cool then for me to use. If you could please post your ExpressPCB file up too that would be great. I would be intrested in making up a few boards at a PCB maker that I use. If anyone would be wanting one I would be up for making a few extra on my run. Thanks!
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post #10 of 19 Old 02-07-2010, 03:20 PM
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Heathyoung,
Could you post your ExpressPCB file when you have the time? I am looking to go ahead and have some boards made up. Really would help if i could have your file. Thanks!
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post #11 of 19 Old 02-09-2010, 05:28 PM - Thread Starter
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I'll post it if I get a chance today, its on my home machine.
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post #12 of 19 Old 02-11-2010, 06:33 PM - Thread Starter
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As requested - It still suits a double-single sided (ie. no through-hole plating) approach for anyone who wants to use it.

Zipped BTW. Can't upload.pcb files natively.

To open it, you need the ExpressPcb app from http://www.expresspcb.com/

I don't use their board service, I only use the software to make press-n-peel printouts to make my own.

 

IFB-12HY.zip 31.474609375k . file
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post #13 of 19 Old 02-11-2010, 06:43 PM
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Quote:
Originally Posted by heathyoung View Post

As requested - It still suits a double-single sided (ie. no through-hole plating) approach for anyone who wants to use it.

Zipped BTW. Can't upload.pcb files natively.

To open it, you need the ExpressPcb app from http://www.expresspcb.com/

I don't use their board service, I only use the software to make press-n-peel printouts to make my own.

Where do you get the press and peel printouts?

Athanasios
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post #14 of 19 Old 02-15-2010, 02:15 PM - Thread Starter
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??? Google is your friend...

This... http://www.techniks.com/how_to.htm

Its good stuff, easier than positive photoresist...
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post #15 of 19 Old 03-04-2010, 07:05 PM
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Say Heath,
Looking to make up a card in a few days and i have a question. What did you use to counter sink the holes on the ground plane and where did you find the internal edge connector to buy? Could you post a finished picture of your finished card? Thanks!
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post #16 of 19 Old 03-09-2010, 06:17 PM - Thread Starter
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I countersinked the holes with a 3mm drillbit (by hand).

The edge connector I actually ratted from a blown microphone input card from an Ogenic console (radio station desk), but they are available around the place...

Eg. available from a mob called Altronics here in Australia.

http://www.altronics.com.au/index.as...=item&id=P4896

I'll take some photos tonight if I get a chance for you.
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post #17 of 19 Old 03-09-2010, 07:33 PM
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Hold on a sec...

I picked up a 1272 a couple of years ago from a fellow forum member that had a home built component input/transcoder on it.

I gave the pj to a friend since I only wanted/needed the spare NEC (...for the lenses!) that he threw in with the deal!

My friend should still have it somewhere in his house!

PM me and I will get in touch with him and ask, I know he still uses the 1272....and if he has it I will send it to you...all you have to do is pay for shipping!

Not sure of how good of a device it is but at least it will take in the signal...I think it was good for 1080i/480P/720p...not sure though!

Worth a shot!

Martin
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post #18 of 19 Old 03-09-2010, 09:47 PM
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Martin that would be great! Would love to give it a try. I have bought some of the materials for Heath's DIY card but it would be fun to just try my hand at printing off some PCB's.
I'm in Moorhead MN so let me know what you think the shipping would be and i can paypal, check or cash you back. Thanks for offering!
Take care,
Andrew
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post #19 of 19 Old 03-09-2010, 09:50 PM
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Andrew

You are very welcome, I left my friend an email message a few minutes ago and once he gets back to me it is yours!
I figured no one is using it and it is probably just sitting in a closet or something so why not send it to someone that actually needs it and can make use of it.

Shipping will not be any more than 20 bucks or so.

Will keep you advised

"Morehead" (...what a name!) hehe

Martin
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