[Coco] CoCo 2 Factory Composite Video RE'd

[Zippster]

I’m not completely sure on pricing yet but kits will be around $15,
assembled around $25 on the Type A.  Type B will be about $7 more as it
will require an additional switch and another small pcb.

As I’m sure many are a bit leery of doing the soldering rework to pull the modulator
and put in the board, I can probably install a few of these for people if they send me their
motherboard once I finalize the board design (with a little compensation for my time).

I put the schematics up for those who are interested in taking a look at them.
They look a bit strange because they were entered as I traced out the circuit,
but they are here…

<https://sites.google.com/site/thezippsterzone/coco2-composite-board-2/schematic-and-circuit-commentary <https://sites.google.com/site/thezippsterzone/coco2-composite-board-2/schematic-and-circuit-commentary>>

Also, here is a picture of a fully installed prototype on a 26-3134 motherboard.

<https://sites.google.com/site/thezippsterzone/coco2-composite-board-2/prototype-progress <https://sites.google.com/site/thezippsterzone/coco2-composite-board-2/prototype-progress>>

- Ed


> On Dec 20, 2014, at 1:12 PM, Mark D. Overholser <apple2 at markoverholser.com> wrote:
> 
> On 12/13/2014 21:27, Zippster wrote:
>> Hi Everybody,
>> 
>> I’ve successfully reverse-engineered the factory composite board
>> found in a CoCo 2 I purchased on ebay.  This board is a direct
>> replacement for the RF modulator. It requires no modifications to the
>> case, and uses the channel switch to select B&W or COLOR.
>> 
>> It seems to have very good output - I’d say better than the reference
>> circuit from the 6847 data sheet. It’s a more involved circuit with
>> voltage regulators on-board and is AC coupled.
>> 
>> Pics of the factory and re’d prototype can be seen here for those who
>> are interested.
>> 
>> <https://sites.google.com/site/thezippsterzone/coco2-composite-board-2
>> <https://sites.google.com/site/thezippsterzone/coco2-composite-board-2>>
>> 
>> 
>> 
>> - Ed
>> 
> 
> 
> 
> I would be interested in Two Kits.  I have a 26-2127B and plan to acquire another, so make them both 'A' Kits...
> 
> Have you determined the pricing???
> 
> Also, Thanks Again for getting the CoCo SDC Built in OCT-NOV-2014...
> 
> MarkO