[Coco] CoCo 2 Factory Composite Video RE'd

[David Ladd]

Zipster,

Could you put me down for a Type A?  Please :D

Also do you accept paypal for the money? :D

Thanks,
Dave
--
David Ladd
--



On Sun, Dec 21, 2014 at 12:08 AM, Zippster <zippster278 at gmail.com> wrote:
> 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
>
>
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