Preamp using the current series feedback circuit

  
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Pre-amplifiers using current feedback circuit tandem type, its output impedance is approximately DC collector resistance Rc ,, surface
Preamp using the current series feedback circuit - schematic

RC attenuator input impedance of the network is the load impedance of the amplifier. If the tone control circuit without R3, then, when you lift the treble, the equivalent load impedance of the amplifier can be drawn in the form of Figure 1-67.




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