Guest 4electros Posted February 23, 2006 Report Share Posted February 23, 2006 what's the main difference between op-amp and diff op-amp in general or actually in some detail Quote Link to comment Share on other sites More sharing options...
Staigen Posted February 24, 2006 Report Share Posted February 24, 2006 HiIsn't diff op-amp short for differential operational amplifier?Isn't op-amp also short for differential operational amplifier?Then your question dont make sense to me! ???Correct me if i'm wrong!//Staigen Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 24, 2006 Report Share Posted February 24, 2006 A single opamp used as a differential amp isn't useable because negative feedback to its inverting input causes that input to be a low impedance much less than its non-inverting input.Therefore 3 opamps are used, with 2 opamps at the inputs of the differential amp. Then the circuit has a high input impedance and a balance of its inputs. Quote Link to comment Share on other sites More sharing options...
Guest 4electros Posted February 24, 2006 Report Share Posted February 24, 2006 the first image includes a single op-amp used as diffamp and the second includes two opamps connected to the inputs of the third diffamp so to make it balanced , the third image as same to second with a bit little difference ...but the third diffamp also have negative feedback connected to its inverting input so does that affects the impedances at its inputs and make the diffamp non- balancedi need more clarify about, with all my respects!thanks a lot! Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 24, 2006 Report Share Posted February 24, 2006 but the third diffamp Quote Link to comment Share on other sites More sharing options...
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