Audioguru
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In his first post he said he is multiplexing his RTDs and the unconnected ones cause the opamps to saturate. I think each RTD should be filtered then the outputs of the filters should be multiplexed.
I have never seen an opamp buffer (follower) like from the Microchip application note as shown here. I show three circuits that produce the same output from a low resistance source:
I have never seen an opamp buffer (follower) like from the Microchip application note as shown here. I show three circuits that produce the same output from a low resistance source: