it's not magic. it's electrodes.

your brain produces tiny electrical signals. different patterns mean different things -- focus, calm, stress, sleep.

traditionally you'd need a lab full of equipment to read them. we fit it in an ear tip.

the ear canal is actually one of the best places on your body to pick up brain signals. neuroscientists have known this for years.

same earphones in butter colorway

technical specs

eeg 1-channel differential (INA128, 1003x gain)
electrodes 2 dry ear-tip electrodes + active DRL ground
input buffers OPA2376 for impedance matching
codec CM108AH USB audio -- 48kHz, 16-bit
passband 1-34 Hz (alpha, theta, delta bands)
connection USB-C -- driverless, no firmware, plug & play
bom cost ~$10-11
pcb 55x35mm
processing all signal processing on your phone

the entire analog front-end costs less than lunch and fits in the inline controller you'll fidget with in your pocket.

signal chain

ear electrode amp codec usb phone ai

based on research from the OpenEarable ExG paper -- UbiComp '24 best paper award

same earphones in periwinkle colorway

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