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  • TerryS3 commented on cah6's instructable DIY EEG (and ECG) Circuit5 months ago
    DIY EEG (and ECG) Circuit

    Seconded. Also, the use of 9V batteries should be emphasized. You do NOT want to use any sort of wall power. An optoisolator such as listed below would be a good output option. With this, a true isolating transformer supply might safely be used for main power, with a battery only on the output.https://www.sparkfun.com/products/retired/784

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