FreeEEG32 was presented 3 years ago on hackster: https://www.hackster.io/news/neuroidss-set-to-release-the-freeeeg32-electroencephalography-platform-5bd871d55e87 but where else? It uses a 8-Channel, 24-Bit, Simultaneous Sampling ADC Data Sheet AD7771: https://www.mouser.com/datasheet/2/609/AD7771-1501978.pdf OpenBCI and PiEEG use the ADS1299 EEG chip: https://www.ti.com/lit/ds/symlink/ads1299.pdf Only the ADS1299 EEG chip with 8 channel is on Aliexpress around 100 USD: https://vi.aliexpress.com/item/1005005717604246.html But FreeEEG32 offers 32 channels for $199 …
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