HEARTBEAT_MONITOR

Published:2009/6/22 22:42:00 Author:May | From:SeekIC

An IR photodiode, which senses IR skin reflectivity as a result of increased blood volume during the periods that the heart forcibly contracts, is used to pick up a signal that is correlated with the heartbeat. A transistor and op amp raise this to a level suitable to trigger logic circuitry or to be displayed on a scope.



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