simple schemes on current amplification

Discussion in 'The Projects Forum' started by SaraSa, Aug 4, 2010.

  1. SaraSa

    Thread Starter Member

    Feb 11, 2009

    I have variable analog's voltage in input but its current is about mA or less than it. the output current should be about 1-2 A without any drops in voltage.I mean that Vout=Vin exactly, maybe it is varaible! I need some schemes showing these objects.

    Any help will be appreciated.
  2. eblc1388

    Senior Member

    Nov 28, 2008
    What you'll need is not current amplification but power amplification.

    You can either use a power opamp connected up as a voltage follower or an usual opamp follows by a power stage.

    Search for "power opamp" in Google.
  3. SaraSa

    Thread Starter Member

    Feb 11, 2009
    Thanks alot, I searched and surveyed about it.

    I have an usual OpAmp, but its output is 200 nA. I thought that I need Transistor to increase the currents(Ic=B.IB) the ptoblem is that the voltage will drop 0.7V.and less than it, I do not have any voltages.
    for 0.3v = output is 0!!

    can you guide me?