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Add DC offset to AC signal

Discussion in 'General Electronics Discussion' started by Ricperes, Jul 22, 2015.

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  1. Ricperes

    Ricperes

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    Jul 20, 2015
    Hello, I want to add a 2.5V DC to a AC signal, how i can do it? Thanks
     
  2. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Feed the signal through a capacitor and onto the centre of a potential divider or onto a voltage source with a series resistor set for 2.5 V.
    Adam
     
  3. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    Capacitor or opamp.

    A capacitor will allow the ac signal to pass through, just make sure 2.5V is on the other side. Adam has suggestions for this.

    Additionally, you can use a 'summing' circuit which will utilize an opamp... it's overkill, but is another option. It would of course help to know why you want to do this.
     
  4. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    And don't forget he might need a negative supply for the opamp also which could complicate matters.
    Adam
     
    Gryd3 likes this.
  5. BobK

    BobK

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    Jan 5, 2010
    If do it without an op amp, you will probably need an op amp buffer in input or output or both anyway. A passive circuit will have low input impedance and high output impedance.

    Bob
     
  6. Colin Mitchell

    Colin Mitchell

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    312
    Aug 31, 2014
    Firstly you have to provide details of the AC signal, its frequency and amplitude.
    And how it is delivered.
     
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