Oh wew, much more complex circuit then what I had (at least it must work
). Also attached schematic is outdated, OPAMP was changed to MCP6004, instrumentation amplifier was changed to INA826, and full-wave rectifier was changed to one that can work with a single supply. Need to get back to it once higher priority tasks come down.
For the skin contacts I tried using a couple of uSIM headers but not sure how well that would have worked since build circuit had a few issues (should have breadboarded it first). I have also got some proper ones (the ones that have gel on the sticky pad), so have that to fall back on. Is that what you meant by connectors?