So this seems to based around the Texas Instruments ADS1299 chip, which is described by TI as:
The ADS1299-4, ADS1299-6, and ADS1299 devices are a family of four-, six-, and eight-channel, low-noise, 24-bit, simultaneous-sampling delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator. The ADS1299-x incorporates all commonly-required features for extracranial electroencephalogram (EEG) and electrocardiography (ECG) applications. With its high levels of integration and exceptional performance, the ADS1299-x enables the creation of scalable medical instrumentation systems at significantly reduced size, power, and overall cost.
The product page [1] further states that talks SPI with the host system (an STM32 in this project, nice).
US price for the ADS1299 on Digi-Key seems to be in the region of $50 in single-quantity.
Thanks for sharing! Did you have a look what else is needed to attempt to build this? There are some gerber files for the pcb boards + probably the components soldered on top + wires + clips + headband?
Edit: the paper actually mentions the cost of ironbci to be $350
The ADS1299-4, ADS1299-6, and ADS1299 devices are a family of four-, six-, and eight-channel, low-noise, 24-bit, simultaneous-sampling delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator. The ADS1299-x incorporates all commonly-required features for extracranial electroencephalogram (EEG) and electrocardiography (ECG) applications. With its high levels of integration and exceptional performance, the ADS1299-x enables the creation of scalable medical instrumentation systems at significantly reduced size, power, and overall cost.
The product page [1] further states that talks SPI with the host system (an STM32 in this project, nice).
US price for the ADS1299 on Digi-Key seems to be in the region of $50 in single-quantity.
[1] https://www.ti.com/product/ADS1299