[dmarto]

With an active electrode, it should be good enough. After all, we are talking about hobby-grade results.

The Olimex ones are 10-bit (supporting both active and passive electrodes), while it's claimed[0] that 12-bit resolution is sufficient for EEG.

However, it's worth noting that there are obvious advantages to the higher resolution.

[0] https://www.biosemi.com/faq/24bitsystem.htm

[ron_87]

EEG in microvolts, if ADC 12 bits, then reference for ADC should be in millivolts

[mlyle]

He mentions active probes. Active probes have amplification.

As his link makes clear, your ADC just needs enough resolution to measure the signal when the (amplified) offset voltages don't saturate it.

[ron_87]

yes, I told about digital EEG device from this website. To clarify analog device, I need a little more time