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A bit over the top for my needs - but thanks for the input. Opto-isolators are something I know hardly anything about, so the app note makes interesting readingA bit late I know, but on the original question, I've used the HCPL2531 quite successfuly for linear aplications as described in this app note:
https://www.avagotech.com/docs/5954-8430E
And, yes, the RS website search is poor...
The basics of the common type transistor output opto isolator is that the output transistor current (when normally biased by a positive collector-emitter voltage) is proportional to the input LED current and, for low currents, the relationship is quite linear............
Opto-isolators are something I know hardly anything about, so the app note makes interesting reading
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Transistor opto isolators are rather like any BJT.There was me thinking they behaved more like a switch. Thanks for explaining CTR - I've seen it on the datasheets but not understood it.