[Coco] S-Video mod for Coco1

[Luis Antoniosi (CoCoDemus)]

oh great :)

test all the colour modes.




On Sat, Oct 19, 2013 at 6:44 PM, Tormod Volden <lists.tormod at gmail.com>wrote:

> On Fri, Oct 18, 2013 at 12:28 AM, Tormod Volden wrote:
> > I also tried connecting the LM1889 pin 13 to my S-video chroma input,
> > both directly and with a 0.1 uF capacitor, with no luck. I also tried
> > tying the pin with a 1.8kOhm resistor to ground. However I see that in
> > most examples it is followed by an amplifying stage. These stages are
> > always inverting but that should not matter for the color signal.
> > However a impedance matching stage is required to make a 75 Ohm output
> > resistance. I'll try that later. Not sure how the Spanish Spectrum
> > guys got away without it (on the diagram with the red marking).
>
> I got it to work with a simple emitter follower (see
> http://archive.worldofdragon.org/phpBB3/viewtopic.php?f=5&t=4470). The
> quality improvement is not so impressing but it is a start. Some
> tuning and shielding will probably help.
>
> Tormod
>
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>



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