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matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10401
Posted: 01:47am 27 Aug 2016
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Phil
I was never very happy with the circuit so you may want to do something different.
A simpler more robust solution would be to first attenuate the signal and then have a number of opamps with different gains selected onto the input pins using relays