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class b amplifier components

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Discussion in 'Electronics Homework Help' started by pietervdb, Apr 5, 2018.

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  1. Apr 5, 2018 #1
    pietervdb

    pietervdb

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    Apr 5, 2018
    I want to design a class b amplifier and test it with a 100 ohm speaker. I gonna use a vcc of 15V. I want to get a db of 40 but I don't know how I should choose/calculate the capacitors/resistors.
    [​IMG]
     
  2. Apr 5, 2018 #2
    Audioguru

    Audioguru

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    Sep 24, 2016
    Your amplifier is class-AB, not class-B. It is the output stage of an audio amplifier using emitter-followers that have no voltage gain, the gain is a little less than 1. You need a third and probably a fourth transistors to provide the voltage gain of a little more than 100 (40dB) that you want. Usually your two R2's are diodes for temperature control of the current. Nobody makes a 100 ohm speaker, they are usually 8 ohms.

    Here is an audio amplifier that has the diodes I mentioned and its Q1 provides its voltage gain:
     

    Attached Files:

    hevans1944 likes this.
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