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Solving two circuits

  1. Dec 13, 2014 #1
    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 [Broken]
    http://www.myup.ir/images/78167216323705616172.png [Broken]

    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 level

    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Dec 13, 2014 #2


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    Forum rules require you to have a go first. Show us your attempt and tell us where you have got stuck. That way we don't waste time explaining things you already know. There is also a homework template to use.
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