Date   : Sun, 29 Mar 2009 22:52:02 +0100
From   : sai2791@... (Steve Inglis)
Subject: A few Econet questions

On 29 Mar 2009, at 18:24, Michael Firth wrote:

>
> Secondly, can anyone suggest a modern alternative to the MC14411  
> that's suggested as a clock generator in this circuit:
>
> http://www.astro.livjm.ac.uk/~mdt/bbcdocs/econet/hub.gif
>
> Alternatively, presumably an oscillator and counter combination  
> could be used as a simpler alternative to this IC - is that a  
> reasonable assumption?
>
> Next, that circuit suggests the 75159 as a suitable driver for the  
> clock signal - would a 75174 work instead? - it has a single ended  
> input, and is marked as an RS422 differential driver. The 75174 is  
> available at a fraction of the cost of the 75159, which would make  
> it a preferrable alternative.
>

I have also been looking into re-creating one of the Econet hubs for  
my own use.  I was looking for more information about these hubs, i  
seem to remember finding a group on Yahoo or something about 2-3 years  
ago, but i cant find it again.

At the time, there was some discussion about a mark 2, which added  
terminators or a clock.  Does anyone know what that group was, or have  
any documents relating to the hub, apart from the gif.

Cheers

-- 
Steve Inglis