RC COUPLED AMPLIFIER

RC Coupled Amplifier Circuit Diagram

The figure shows the circuit diagram of an RC COUPLED AMPLIFIER.

RC Coupled Amplifier Working Principle:-

These are the basic principles used for RC coupled amplifier, to amplify the signal.

•  R1 and R2 provides necessary biasing to the Transistor Q.

• It will stabilize the Q point near the middle of DC Load line.

•  It is called as Coupling Capacitor.

•  It provides coupling to the input and output signals.

• It helps to achieve maximum power transform

•  It helps to control or drop the supply voltage Vcc.

•  It gives a safer limit of vcc for collector and emitter terminals.

• Emitter capacitor, it also called as Bypass capacitor.

•  It will bypass ac current and restricts dc.

• Due to this only dc voltage will drop across emitter resistor.

• If we neglecting the Bypass capacitor, ac voltage will drop across.

ADVANTAGES OF RC COUPLED AMPLIFIER

• We can be able to amplify any signal in Audio frequency range.

•  It provides faithful amplification of input signal.

•  Simple circuit diagram

•  By using the transistor BC107 it provides an amplification factor of nearly 50.

DISADVANTAGES OF RC COUPLED AMPLIFIER

• Bjt Amplifier will oscillates on higher frequency range.

•  Band width is comparably narrow than JFET amplifier

DC BIASING CONDITIONS

•  Voltage drop across collector resistor Rc

•  Voltage drop across emitter resistor Re

•  Voltage drop across Collector-Emitter terminal should be equal to 50% of Vcc.

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Inorder to achieve faithful amplification of input signal, the Q point must be selected in the middle of DC Load Line.

To stabilize the Q point in the middle and make it independent of temperature variations we are using voltage divider bias.