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One of my fave devices at Maker Faire Bay Area was (the future Mrs. Gareth Branwyn) Jeri Ellsworth’s “Brain Bulb,” a light bulb poised over her head which could read and respond to her “brain waves.” Here she describes the basic hardware and circuit design behind the device. The circuit is built around a low-power Analog Devices AD620 instrumentation amp.


Jeri (and some guy whose name I don’t recall) and her Brain Bulb at Maker Faire

Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.


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