[Coco] *COOL* Look what I found! (VideoMod for CoCo2)

[N8WQ]

Hi Fedor,
Your board is clearly a "through hole" project.
I can see the 4 transistors, variable cap and potentiometer on the 
circuit board.
That looks like a nice project for the CoCo.

Alan Jones

-- 
N8WQ - Canal Winchester, Ohio
http://exwn8jef.googlepages.com/home
http://n8wq.blogspot.com



Fedor Steeman wrote:
> Hi all,
> Well, there is definitely a little board to be added, but I do not know the
> technical jargon for this technique. Of the modified CoCo2 I possess that
> has this videomod, I added a range of pictures to my gallery on
> coco3.comfor the interested to peek at:
>
> http://coco3.com/modules.php?name=Gallery&g2_itemId=1483
> <http://coco3.com/modules.php?name=Gallery&g2_itemId=1483>
>
> Cheers,
> Fedor
>
> PS: Nobody interested in the SCART connector? :-(
>
> 2009/1/8 N8WQ <exwn8jef at gmail.com>
>
>   
>> Hi George,
>> The last time I looked the Color Computer (1, 2, or 3) didn't have any
>> surface mount components. LOL
>> The circuit has 22 parts, which includes one variable capacitor and one
>> potentiometer.
>> If you look on page one you can read "SMD technick."
>> He clearly shows the circuit raised on top of the rf video modulator.
>>
>> Alan Jones
>>
>> --
>> N8WQ - Canal Winchester, Ohio
>> http://exwn8jef.googlepages.com/home
>> http://n8wq.blogspot.com
>>
>>
>>
>> George Ramsower wrote:
>>
>>     
>>> ----- Original Message ----- From: "N8WQ"
>>>
>>>  Hi Fedor,
>>>       
>>>> That looks like a SMT (surface mount) component layout. A SMT pc board
>>>> would have to be made or you could use what us home brewer's call "manhattan
>>>> style" construction. Or we could translate the project to "through hole"
>>>> components. It would be nice to see the schematic though. LOL
>>>> The BSR14 is a NPN general purpose amplifier.
>>>>
>>>> Alan Jones
>>>>
>>>>         
>>> He's showing where on the RF modulator to make connections. The ckt he
>>> built only has about three or four parts on it.
>>> Usually this mod only require a transistor to invert and amplify the video
>>> that goes into the modulator.
>>> Although I can't read what he's said, it looks to me to be an installation
>>> guide for the little ckt. This is probably why there's no schematic of the
>>> actual ckt.
>>>
>>> George
>>>
>>>       
>>>>
>>>> Fedor Steeman wrote:
>>>>
>>>>         
>>>>> Hi all,
>>>>>
>>>>> While going through the huge lot of copied CoCo Manuals I inherited from
>>>>> Michel Collette, a former Dutch CoCo-society regional coordinator, I
>>>>> discovered the following schematics for making a video buffer mod for
>>>>> the CoCo2, enabling a CoCo2 to be coupled up any television or video
>>>>> equipment with a composite video input:
>>>>>
>>>>> http://www.steeman.dk/CoCoManuals/VideoMod_(KoenVaartjes).pdf
>>>>>
>>>>> How cool is that!?
>>>>>
>>>>> It is all in Dutch, written by someone called Koen Vaartjes, but if
>>>>> people
>>>>> are interested I could translate, clean it up, perhaps redo the
>>>>> schematics
>>>>> in a graphics editor and put it up on a webpage!
>>>>>
>>>>> Some of the equipment i inherited from Michel Collette actually included
>>>>> a
>>>>> CoCo2 with this video mod. I tried it out when I first discovered it and
>>>>> it
>>>>> worked flawlessly then. After having transported the CoCo one time,
>>>>> however,
>>>>> something went wrong, because after that all I got was a black screen
>>>>> and no
>>>>> sound. I believe there must be a loose contact somewhere, because every
>>>>> now
>>>>> and then when I try it, it works again.
>>>>>
>>>>> The final page looks like a schematic of a scart cable (
>>>>> http://en.wikipedia.org/wiki/Scart) that is widely used in Europe at
>>>>> least.
>>>>> I do also have a modified SCART cable that can be used to hook up the
>>>>> RGB-output of a CoCo 3 to a normal television with a scart input. That
>>>>> too
>>>>> once worked, but not anymore. Maybe if someone could help me understand
>>>>> the
>>>>> schematic, and figure out what wires of a RGB-cable should be connected
>>>>> to
>>>>> what pin of the scart, I could try to fix the cable or make a few more
>>>>> for
>>>>> anyone interested... This would mean that a CoCo3 could be connected
>>>>> from
>>>>> the RGB output directly to a television with scart input.
>>>>>
>>>>> Cheers,
>>>>>
>>>>> Fedor
>>>>>
>>>>> --
>>>>> Coco mailing list
>>>>> Coco at maltedmedia.com
>>>>> http://five.pairlist.net/mailman/listinfo/coco
>>>>>
>>>>>
>>>>>
>>>>>           
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>>>       
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>
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