Thanks for this Dave - will look at the link in a minute. Meanwhile, have had a few problems with the phantom power frying the chips! Would some diodes protect the input? Any suggestions?
http://www.analog.com/-/media/image...ltage-protection/opamp-input-fig-01.png?la=en
That ^ should show the basic idea, 2 diodes reverse biased by the supply. 1n4008s are a common choice. (you don't need the input R)
Dave.