An overview of the initial hardware architecture for the VolksEEG open-source EEG prototype. The design pairs an Adafruit Feather nRF52840 Sense MCU with a TI ADS1299 analog front end (8-channel ADC with PGA). A key design concern is patient safety through electrical isolation: the system is split into non-isolated and isolated domains, with specific chips (including the ADUM240E1BRIZ-RL digital isolator and MEJ1S0305SC DC-DC converter) bridging the domains. The post also advocates for high-level abstracted power and signal diagrams alongside detailed KiCad schematics to aid understanding and communication among contributors.
