Heartbeat monitor


Posted on Jun 9, 2012

? simple heart-beat transducer can be made from an infrared LED and an infrared phototransistor. ?t works because skin acts as a ref1ecti?e surface for infrared light. The lR ref1ecti?ity of one's skin depends ??? the density of blood in it. Blood density rises and falls with the pumping action of the heart.


Heartbeat monitor
Click here to download the full size of the above Circuit.

80 the intensity of infrared ref1ected by the skin (and thus transmitted to the phototransistor) rises and falls with each heartbeat.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

29Mhz-amplifier
Low-light-level-drop-detector
RC5 Repeater
NIXIE I NIXIE clock using six ZM1030 tubes
Wide-Range Doppler Antenna
An induction motor dynamic braking control circuit
Gas flameout alarm circuit



Top