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

audio notch filter
Divide-By-2-Or-3 Circuit
Drive Two-Six White LEDs (WLEDs) in Parallel
SDR Soundcard Tester
Cipher scheme of the module of infrared remote-control between two parties of intellectual family
power-amplifier 2
Communication between a USB/serial device and an AVR (atmega/Arduino) microcontroller
UPB1009K Necs Low Power Gps Rf Receiver Bipolar Analog Integrated Circuit
Build a USB Powered AA NiMH and NiCd Battery Charger
Puxing 777 Radio Headset Schematic
A Keypad Circuit That Will Convert From Decimal To BCD Decimal



Top