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Great project, thanks for posting. I'm going to build this over the holidays. However, I noticed you are not using audio amplifiers for this but instrument amplifiers. Was this a conscious choice or just what you had 6 of in your tool box? Even the data sheet of the LT1055 is conspicuously lacking audio as a suitable use. Wouldn't something like a high-performance audio OpAmp like the OPA4134 be more suited for this project?
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