[sdiy] Inverting Amplifier as a Buffer Output.

[Oscar Salas]

Hello all, 
 
I have drawn below two different configurations of an inverting amplifier as buffer output:
A) The feedback resistor is taped -before- the output resistor.
B) The feedback resistor is taped -after- the output resistor.

The case A) has voltage drop when it is conected to another module input.
This is solved in the case B) where there is not voltage drop. 
So, it seems a better solution.

What advantages has the case A) versus the case B) if any?


                             ----/\/\/\/\-------
                             |                 |
A)                           |                 |
                             |  =              |
                             |  =   =          |
      -----------/\/\/\/\-------=  --   =      |
                                =           =-----------/\/\/\/\
                            ----=  +    =
                           |    =   =
                           |    =
                         __|__



                             ----/\/\/\/\----------------
                             |                           |
B)                           |                           |
                             |  =                        |
                             |  =   =                    |
      -----------/\/\/\/\-------=  --   =                |
                                =           =---/\/\/\/\----------
                            ----=  +    =
                           |    =   =
                           |    =
                         __|__