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GCSE     Capacitor     Coupling     Decoupling     Explosion     >More Uses<     Parallel     RC Timing     Series     Smoothing    

Capacitor More Uses


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  GCSE    Capacitors  0 of 22    Question 1307    Audio Amplifiers 
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Deadline not set3 of 22    Question 919    Biasing 
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Deadline not set4 of 22    Question 428    Capacitance Units 
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Deadline not set5 of 22    Question 180    Capacitor Basics 
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Deadline not set7 of 22    Question 426    Capacitor Charge 
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Deadline not set9 of 22    Question 1472    Capacitor Decoupling 
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Deadline not set10 of 22    Question 429    Capacitor Facts 
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Deadline not set11 of 22    Question 430    Capacitor Facts 
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Deadline not set12 of 22    Question 431    Capacitor Facts 
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Deadline not set13 of 22    Question 1215    Capacitor Uses 
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Deadline not set14 of 22    Question 1216    Capacitor Uses 
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Deadline not set15 of 22    Question 1217    Capacitor Uses 
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Deadline not set16 of 22    Question 1304    Capacitors 
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Deadline not set17 of 22    Question 555    Capacitors 
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Deadline not set18 of 22    Question 276    Components 
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Deadline not set19 of 22    Question 1427    Identify the Component 
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Deadline not set20 of 22    Question 1428    Identify the Component 
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Deadline not set21 of 22    Question 1429    Identify the Component 
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Deadline not set22 of 22    Question 432    Remove High Frequency Pulses 
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In your project report, you have to describe how your circuit works. If your circuit contains a capacitor, one or more of the following explanations should be useful.

Timing

  • R C timing circuits use a resistor and a capacitor for timing purposes.
  • The capacitor charges through the resistor.
  • A bigger resistor will make the capacitor take longer to charge.
  • Also a bigger capacitor will take longer to charge.

Coupling

  • A capacitor connecting two subsystems.
  • Also known as a DC blocking capacitor.
  • Couple an AC signal from one subsystem to the next.
  • Prevent DC potentials from being coupled from one subsystem to the next.

Decoupling

  • Remove unwanted AC signals from the circuit.
  • One capacitor leg is connected to ground and any AC signals are passed straight to ground.

Smoothing

  • DC power supplies produce lumpy DC.
  • The smoothing capacitor stores enough charge to smooth out the lumps.
  • Smoothing capacitors are often very big.
  • To improve the smoothing effect, use a bigger capacitor.
  • Smoothing is really the same as decoupling. You want to remove the unwanted AC ripple.

Frequency Filtering

  • This is an A Level  topic but many GCSE and AS projects might need to take this into consideration.
  • Since capacitors pass high frequencies and block low ones and DC, they can be used to filter low or high frequencies.
  • Capacitors can be wired up to couple (pass) or decouple (block) higher frequencies.

Tuning

  • When combined with an inductor, a tuned circuit is formed.
  • This is used in radio tuning to select the wanted signal and reject others.

Capacitor Usage Examples

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