Solve Two Circuits: PPG & 2-ch Amplifier | Find KVL, KCL, LED Output

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SUMMARY

The discussion focuses on solving two electronic circuits: a photoplethysmograph (PPG) and a 2-channel amplifier for MP3 applications. The PPG circuit requires a 9-volt power supply and outputs to an LED, while the amplifier circuit is designed to enhance audio signals. Key concepts include applying Kirchhoff's Voltage Law (KVL) and Kirchhoff's Current Law (KCL) to analyze these circuits. Participants are encouraged to provide their initial attempts and specify where they encounter difficulties to facilitate effective assistance.

PREREQUISITES
  • Understanding of Kirchhoff's Voltage Law (KVL)
  • Understanding of Kirchhoff's Current Law (KCL)
  • Familiarity with PSpice simulation software
  • Basic knowledge of LED and phototransistor operation
NEXT STEPS
  • Research how to implement KVL and KCL in circuit analysis
  • Learn to simulate PPG circuits using PSpice
  • Explore the design and functionality of 2-channel amplifiers
  • Study the characteristics of LEDs and phototransistors in sensing applications
USEFUL FOR

Electronics students, hobbyists working on circuit design, and engineers involved in biomedical applications or audio signal processing will benefit from this discussion.

amirgh
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hi
i need help to solve these two circuit as my professor said in university.
i must find the value of each part to make these two circuits in pspice and in breadboard.

i need the values and KVL and KCL.
the first photo is PPG and voltage for each v must be 9 volt and output must be LED.
the second one is 2 channels amplifire for mp3.

http://www.myup.ir/images/74176609090443184933.png
http://www.myup.ir/images/78167216323705616172.png

more information about first one :

The photoplethysmograph (PPG) is a device with which one may monitor an individual’s pulse by measuring the light transmittance through a finger, earlobe or toe for example. The word plethysmograph comes from the Greek plethysmos,meaning enlargement, which in this case refers to the slight enlargement of the arteries with surges in blood flow as the heart pumps. A typical PPG circuit consists of a light-emitting diode (LED), a phototransistor (PT) or photodiode that responds to received light by generating a photocurrent, and amplification circuitry to bring the signal to a more manageable levelthanks
 
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