[Coco] Another rare brazilian coco clone...

[Luis Fernández]

HiSaw that has a pause button, or switch

> Date: Sun, 27 Jan 2013 23:55:27 -0200
> From: daniel.campus at gmail.com
> To: coco at maltedmedia.com
> Subject: Re: [Coco] Another rare brazilian coco clone...
> 
> Hi Dennis,
> 
> The circuit I used is based on the schematic present at page 12 of the 
> MC6847 datasheet:
> 
> http://people.ece.cornell.edu/land/courses/ece4760/ideas/mc6847.pdf
> 
> In the place of the 3.9K and 3.3K resistors, I changed both for 10K 
> resistors. The 470 Ohms resistor I removed. In the place of the 560 Ohm 
> resistor I put a 1K trimpot for fine tunning.
> On mine I also put two trimpots in pulldown on both B-Y and R-Y lines 
> that come from 6847 to 1372. It helps both to regulate colors and 
> decrease color saturation.
> All else remains exactly the same as on the datasheet.
> 
> I used this formula on both MX-1600 and on the Color64, another Coco 
> clone I have:
> 
> https://picasaweb.google.com/109345699838454178536/LZColor64#
> 
> Regards,
> Daniel
> 
> Em 27/01/2013 23:25, Denis Bisson escreveu:
> > Daniel Campos <daniel.campus at ...> writes:
> > ...
> >> Last week I acquired another rare brazilian coco clone, the Dynacom MX-1600.
> >> https://picasaweb.google.com/109345699838454178536/DynacomMX1600
> >> It came on bad shape and not working, but after some work, it's fully
> >> functional again.
> > ...
> >
> >    Hi!
> >
> >    Nice picture and work!
> >
> > May I asked you if you could share with me the MC1472 circuit you made?
> >
> > I've already made something like that two times in the past to convert regular
> > COCO to provide NTSC signal directly. But according to your picture, you have
> > much more potentiometers than the application note I am using for that patch.
> > I would be curious to use your circuit as your picture seems to show a better
> > result.
> >
> > Thanks.
> >
> > Dennis.
> >
> >
> >
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> 
> 
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