Above is the circuit for a photoplethsmography heart rate monitor….

Question Answered step-by-step Above is the circuit for a photoplethsmography heart rate monitor…. Image transcription text+5V T B V+ 2.2UF R3 C1 4.7k R1 R2 < 22k 39 Purple or A R5 R4 100k Red wire Drange or NPNPHOTOTRANSISTOR! 100k 10k R6 blue wire C DZ LED1 C2 68nF Yellow or D3 Green wire Brown or Whitewire Dashed blue lines indicate the sensor itself, the rest will be built on the circuit board. Sensor... Show moreAbove is the circuit for a photoplethsmography heart rate monitor. What is the purpose of the diodes (not LEDs, just diodes) in the circuit? Engineering & Technology Electrical Engineering BME 3020C Share QuestionEmailCopy link Comments (0)