[sdiy] Inverting Amplifier as a Buffer Output.

[David G. Dixon]

Hey Oscar,

I used to use A all the time, but now I use mostly B, because I found that
it is a helluva lot easier to lay out on the PCB, with or without the 10pF
cap (which I always make provision for, whether I use it or not).  I have
noticed no difference in how my circuits perform.

My $0.02 (probably only worth $0.01).

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