opamp / comparator question BY gallie

Discussion in 'General Electronics Chat' started by bertus, Jun 22, 2011.

  1. bertus

    Thread Starter Administrator

    Apr 5, 2008

    just wanna ask if op amps/ comparators can have a V(input AC)?? I do know that to power up an op amp you will use DC. but im confused in the V(input ) part. (the one we use to connect in function gen). Can I input AC there? or just DC?


    PS I am posting it here as I found this in my email.

  2. Adjuster

    Well-Known Member

    Dec 26, 2010
    In general, op-amps and comparators can handle AC inputs, provided that the voltages and currents are within the capabilities of the devices concerned. The fact that they can be described as DC amplifiers (or DC level detectors) does not mean that they are restricted to DC input, only that they have responses extending own to DC.
  3. Audioguru

    AAC Fanatic!

    Dec 20, 2007
    An opamp can produce an accurate copy of the input (at a low level or fairly high level) like music, voices or sine-waves. It can also make an output at many different voltages.
    But the output of a comparator is a logic high or low which makes square-waves or a DC high or a DC low.