Hello,

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.

 

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.

 

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?