Audio Amplifier

Discussion in 'Homework Help' started by NSCC_EETN, Dec 13, 2010.

  1. NSCC_EETN

    Thread Starter New Member

    Oct 6, 2010
    17
    0
    A tank circuit drives the output of the amplifier during the short conduction times of the transistor. The remainder of the time, a constant square wave from the transistor's conduction pulses keeps the oscillation of the output going until the next time the transistor conducts.

    Can someone enlighten me on how a transistor in a tuned class C can put out a square wave?

    Original Quote from a website:

    "If you parallel a capacitor and an inductor you form a tuned circuit. If you pulse a voltage across a tuned circuit, it oscillates as magnetic fields in the inductor and electrostatic fields in the capacitor transfer energy to each other. The constant square wave pulsing from the transistor maintains the oscillation to produce your output waveform."
     
    Last edited: Dec 13, 2010
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    In Class C mode there a short conduction intervals in which the current pulse excites the output tank. The output is not a square wave - it is notionally a sinusoidal wave at a frequency equivalent to the tank resonant frequency. The drive pulses are provided at a repetition rate equivalent to this same frequency.
     
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