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Heartbeat Monitor Circuit

2015-01-24 07:10  
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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.
Heartbeat Monitor Circuit

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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