As blog’s stats shows a lot of us today are dreaming of a cheap EEG device – most traffic is coming from Google searches “cheap eeg”, “cheapest eeg hardware” and the like =) From cheap EEG devices available, cheapest are those you build yourself. Currently there are various DIY EEG hardware designs & building instructions available on the Internet. Here is a short survey on what we have.
Note: for total novices, best place to start with EEG is short intro on How EEG Machine is Made.
The most popular
It even doesn’t need a mention – because it’s most popular of the EEG hardware designs, everyone who searches for DIY EEG will get it in top results. This device has 6 channels but can be expanded to 16.
State of the art
ModularEEG is good design to start from but now, as technology advances, it’s getting older and older. Here are designs that are more up-to-date.
CEEGALS stands for CogniPve Electroencephalography AcquisiPon Laboratory System. This update to ModularEEG allows to wirelessly transfer EEG signals from head to computer. Don’t click the link: site is under construction and contains almost no useful info yet. Instead, check here for some details about the project.
“The purpose of this project is to create a EEG that is modernized with some of the latest hardware. The Design uses lower amplification and higher bit analog to digital converters to remove the need for filtering and amplifying.”
Site contains schematics for several designs: Single Channel FM Unit, Two Channel AM Unit, Two Channel FM Unit, Four Channel AM Unit (advanced design), Four Channel Multiplexed AM EEG Unit & Eight Channel EEG Unit. Additional info about this project is on OpenEEG website.
From the website: “I developed my 4-channel, dual-purpose EEG/ECG box … We combined schematics from his book Biofeedback and the Arts (available thru Frog Peak Press) with schematics from the article “Computers On The Brain” by Steve Ciarcia (in the June 1998 issue of BYTE magazine)”