@biomurph How did you set up your electrodes for measurement? I would guess the recording (Px or Nx) and reference (SRB) electrodes need to be active. However the Bias (or ground) electrode should be passive. Is this how you were set up when you tested the Olimex ones?
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Just my two cents but now its 2024 and active electrode development may be a ripe application for tinyML
Active electrodes are now in the Shop.
https://shop.openbci.com/products/thinkpulse-active-electrode-kit