Date   : Mon, 25 Feb 2002 15:25:36 -0000
From   : "Kris Adcock" <krisa@...>
Subject: Re: Circuits involving a SAA5050?

> -----Original Message-----
> From: owner-bbc-micro@...
> [mailto:owner-bbc-micro@...]On Behalf Of John Woodgate
> Sent: 25 February 2002 14:22
> To: bbc-micro@...
> Subject: Re: [BBC-Micro] Circuits involving a SAA5050?
>
>
> I read in !bbc-micro that Kris Adcock <krisa@...> wrote (in
> <001701c1bdf3$d4ad3bf0$c7eea8c0@...>) about '[BBC-Micro] Circuits
> involving a SAA5050?', on Mon, 25 Feb 2002:
> >Greetings earthlings,
> >
> >For several years now I've been maintaining a RiscPC system
> with a teletext
> >decoder card in it. The card is being used to produce an
> 80x25 screen of
> >text as a composite video signal. Now, I need to replace
> this card, mostly
> >because the card has a TV tuner in it, and the property
> where the computer
> >is based does not have a TV licence. So, I'm looking to build my own
> >'serverely simplified' version of the card. Using an SAA5050
> chip seems to
> >be an obvious choice, so I was wondering if anyone on this
> mailing list has
> >any experience using this chip, or has built anything
> similar. I'm pretty
> >good at taking existing circuit diagrams and butchering them
> to my own evil
> >ends, but not so hot on starting from scratch.
> >
> Can you not just disconnect the power supply to the TV tuner part?
> Without the tuner oscillator going, the detector van will not react.

No, I want to use the card elsewhere. I want to replace it with a home-made
circuit.