Lecture Notes - Chapter 6

(These Lecture Notes are for courses using the book the Complete Electronics Self-Teaching Guide with Projects. Instructors of courses using that text are permitted to use these Lecture Notes as-is or adapt them for their use).

Filters

• Capacitors in AC Circuits
  •  Reactance of capacitor is equivalent to resistance in resistor.
  •  Discuss how the reactance of capacitors changes with frequency.
    •  Higher frequency results in low reactance.
  •  DC voltage is blocked by capacitors.       
• Capacitors and Resistors in Series
  •  Impedance of a capacitor and resistor in series is similar to the total resistance of two resistors in series.
  •  RC series circuit with the output voltage measured across the resistor.
    • Discuss the equation for V_out  and it�s similarities to the equation for V_out for a voltage divider consisting of two resistors in series.
    •  Discuss the variation in V_out with frequency (figure 6-7).
    • Introduce the term; high pass filter.
    • Discuss Project 6-1, The High Pass Filter.
  • RC series circuit with the output voltage measured across the capacitor.
    • Discuss how the equation for V_out is changed.
    • Discuss the variation in V_out with frequency (figure 6-18).
    • Introduce the term; low pass filter.
    • Discuss Project 6-2, The Low Pass Filter.
  • Phase Shift of an RC Circuit.
    • Discuss how the phase shift depends upon whether V_out is taken across the resistor or capacitor (figure 6-27).
    • Introduce the term; phasor diagram.
    • Discuss the equation used to calculate the phase angle for an RC circuit.
• Inductors in AC Circuits
  •  Reactance of inductor is equivalent to resistance in resistor.
  •  Discuss the reactance of capacitors changes with frequency.
    •  Higher frequency results in high reactance.
  •  DC voltage is not blocked by inductors.       
• Inductors and Resistors in Series
  •  Impedance of a inductor and resistor in series is similar to the total resistance of two resistors in series.
  •  RL series circuit with the output voltage measured across the resistor.
    • Discuss the equation for V_out.
    • Discuss the variation in V_out with frequency (figure 6-48).
    • Mention that this circuit forms a low pass filter, while a RC circuit with the output voltage measured across the resistor forms a high pass filter.
  •  RL series circuit with the output voltage measured across the inductor.
    • Discuss the equation for V_out.
    • Discuss the variation in V_out with frequency (figure 6-50).
    • Mention that this circuit forms a high pass filter, while a RC circuit with the output voltage measured across the capacitor forms a low pass filter.
  • Phase Shift of an RL Circuit.
    • Discuss how the phase shift depends upon whether V_out is taken across the resistor or capacitor (figure 6-51).
• Discuss the equation used to calculate the phase angle for an RL circuit.

This page includes material extracted, by permission of the publisher, Wiley Publishing, from Complete Electronics Self-Teaching Guide with Projects, ISBN: 9781118217320.

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