Heartbeat Monitor Circuit

Posted on Dec 17, 2012

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
Click here to download the full size of the above 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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