In two-stage RC coupling, the function of a Cc capacitor is:

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RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
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  1. to allow AC and DC to pass
  2. to block AC and DC
  3. to block DC voltage
  4. to block AC input signal

Answer (Detailed Solution Below)

Option 3 : to block DC voltage
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Two-stage RC coupled amplifier

F4 Vinanti Engineering 06.02.23 D14

  • A Resistance Capacitance (RC) Coupled Amplifier is basically a multi-stage amplifier circuit extensively used in electronic circuits.
  • In this amplifier, two common emitter amplifiers are connected through a coupling capacitor (CC).
  • The output from the emitter of the first amplifier is the input to the base of the second amplifier.
  • The purpose of the coupling capacitor is to block DC voltage and pass AC voltage.
  • As a result of this, there is no DC interaction between stages i.e. the DC voltage of the first stage does not disturb the operating point of the second stage.
  • Polyester film capacitors is commonly used for coupling between two circuits.
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