Hi All

Thank you... Thank you ......

I am more confused than ever now.....But all good advice.... I was thinking I was keeping it simple with my 250R and Op-Amp

But lots of good advise here......like the 0-5v to 4.5v Idea.... Never thought :-)

Precision resistor is good ... But again liking the 240R plus Series 10R with diodes

Just swamped...... Thank you Again all

Processing the help

Andy