[Coco] MC6847 + Component video

[Joe Grubbs]

I'll talk to my genius EE friend and see if he can come up with something. His day job is a broadcast engineer, so this might be right up his alley.



> From: zippster278 at gmail.com
> Date: Tue, 21 Apr 2015 16:32:31 -0500
> To: coco at maltedmedia.com
> Subject: Re: [Coco] MC6847 + Component video
> 
> That circuit won’t drive component inputs on a standard television properly.
> I tried it on several quite a while back when I first started playing with the 6847.
> 
> You can get a good Luma only display from the Y portion of the circuit,
> but the color difference signals are completely off as far as level.
> They also aren’t terminated correctly.
> 
> Someone should work up a circuit for this though, component out would be worth
> having.  I’d suggest using op-amps, ac coupling the signal into and out of the amp circuit.
> 
> - Ed
> 
> 
> 
> 
> > On Apr 21, 2015, at 3:32 PM, Joe Grubbs <jsgrubbs at hotmail.com> wrote:
> > 
> > Suweet! Thanks!
> > 
> > 
> > 
> >> Date: Tue, 21 Apr 2015 16:15:52 -0400
> >> From: linville at tuxdriver.com
> >> To: coco at maltedmedia.com
> >> Subject: Re: [Coco] MC6847 + Component video
> >> 
> >> On Tue, Apr 21, 2015 at 04:04:18PM -0400, Joe Grubbs wrote:
> >>> The 6847 datasheet implies that one could connect it a monitor/television with component (Y-BY-RY) inputs via some kind of driver or buffer. Has anyone ever tried this? If so, is there a schematic for a driver/buffer that works well?
> >> 
> >> Daniel Campos has such a circuit.
> >> 
> >> https://twitter.com/RetroCanada76/status/299203476859260929/photo/1
> >> 
> >> -- 
> >> John W. Linville		Someday the world will need a hero, and you
> >> linville at tuxdriver.com			might be all we have.  Be ready.
> >> 
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