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音频放大器设计

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This design uses Common-Emitter Amplifier (Class A) with 2N3904 Bipolar Junction Transistor.

  • Use “Voltage Divider Biasing” to reduce the effects of varying β (= ic / ib) (by holding the Base voltage constant) 
  • Base Voltage (Vb) = Vcc * [R2 / (R1 + R2)] 
  • Use Coupling Capacitors to separate the AC signals from the DC biasing voltage (which only pass AC signals and block any DC component). 
  • Use Bypass Capacitor to maintain the Q-point stability. 
To determine the value of each component, first set Q-point close to the center position of the load line. (RL is the resistance of the speaker.)

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