NASA NTRS · 19650000010
Inexpensive, stable circuit measures heart rate
Abstract
Inexpensive transistorized circuit provides reliable analog indications of heart rate in response to preamplified electrocardiograph signal applied to its input.
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Vick, H. A.. 1965-01-01. Inexpensive, stable circuit measures heart rate. https://ntrs.nasa.gov/citations/19650000010
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