What is a decoupled capacitor?

Discussion in 'General Electronics Chat' started by dar2525, Jul 15, 2005.

  1. dar2525

    Thread Starter Member

    Jun 17, 2005
    21
    0
    I am confused and keep seeing the term "decoupled capacitor" tossed around. How are these capcitor used in circuits? Does it remove DC?

    I asked becaused, I have a circuit with 10nf capacitor and 100ohms in series with each other connected to the gate of a silicon controlled rectifier (SCR). I want to know the purpose of this. The AC sine wave is inputted into the circuit.

    Any help would be great.
     
  2. nanobyte

    Senior Member

    May 26, 2004
    118
    1
    Could someone post a diagram of a simple circuit using a decoupling capacitor(s) with a detailed explanation of how it/ they work in the circuit?
     
  3. n9xv

    Senior Member

    Jan 18, 2005
    329
    1
    Thats an RC Snubber network your seeing on the gate of the SCR. It's used for transient protection. See the application note on the link from Fairchild semiconductor.


    RC Snubber Networks - Application Note
     
  4. dar2525

    Thread Starter Member

    Jun 17, 2005
    21
    0
    Why was the 100 ohms resistor added?
     
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