Friday, November 6, 2009


Dr. Shawn | Make Vol. 11- 2007 | Pdf | 3 pgs | 1 mb
by powerful waves of electrical activity that
cause weak currents to flow in the body,
changing the electric potential between different
points on the skin by about one thousandth of a
volt (one millivolt,1mV). Hidden within that activity
is an enormous amount of information about what
the heart is doing, and anyone who can detect it
can peer into the workings of this incredible organ.

Fortunately, you don't have to be a cardiologist
with expensive equipment to pick up and decipher
that signal. Anyone can do it with this homemade
electrocardiogram (ECG) device. an analog-to-digital
converter (ADC) to digitize the signal and send it to
a computer, and a remarkable book that I'll tell you
about later.

You can assemble the circuit itself in an after-
noon for about $40. The ADC will cost a bit more.
between $50 and $300. But these devices open a
universe of opportunities to the home-based experi-
menter, and so every citizen scientist should invest
in one. (I've negotiated a great deal on one of these
devices especially for MAKE readers. Read on.)

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