I realised I’ve left this project hanging a while now and that’s partly to do with he fact that the chips I was hoping to use didn’t arrive quickly then other things got in the way.

I’ve also hit upon two other snaggs,

• The power supplied from the dimmers is not 10v, so this means adding in two power regulator circuits (one for 5v data and the other a 10v reference),
• The chips will only do 0-5v, which obviously is no good for the 0-10v that’s required.

Never mind – this is still a project i’m working on – just a little more complex than I first thought.