Russell asked:

>I asked about this some weeks ago but a second query may be useful.
>
>I am trialling a Sigma Delta analog to digital converter. This SHOULD
>allow low cost high accuracy A2D with modest conversion speed.
>

  lots skipped

>Any thoughts on the process?
>This is a stunningly cheap and simple method for A2D if it would only
>work :-) - once sorted it would/will prove a boon to other PIC users.
>

  Are you  aware of the article in SENSORS magazine 2-3 yrs ago
  on this topic? The authors were using it for a pressure sensor
  system.

  I'm at home without my resources but if this is of interest I'll find
  it for you.

  Regards,
  Reg Neale