[sdiy] Inverting Amplifier as a Buffer Output.

[Harry Bissell]

You might want to use an opamp such as the time-honored
741 to buffer outputs, they are slow and almost indestructable...

H^) harry


----- Original Message -----
From: David G. Dixon <dixon at interchange.ubc.ca>
To: 'Oscar Salas' <osaiber at yahoo.es>, synth-diy at dropmix.xs4all.nl
Sent: Sat, 26 Jun 2010 15:34:17 -0400 (EDT)
Subject: Re: [sdiy] Inverting Amplifier as a Buffer Output.

Oscar, case C requires no jumper.  The (10pF or so) capacitor goes between
two adjacent pads just next to the IC.  The resistors (and jumpers, if
necessary) are two pads away from the IC, pointing outward.

In my layouts, everything is case A or C (depending on whether I install the
capacitor or not.  Sometimes it helps, sometimes it hinders).

> Note: David, I am also using this way of layout and I saw this you said
> but if you want to implement the case C you will need also the jumper. I
> think.
> 
> 
> 
> 
> 
> 
> 
> 
>                              ----/\/\/\/\-------
>                              |                 |
> A)                           |                 |
>                              |  =              |
>                              |  =   =          |
>       -----------/\/\/\/\-------=  --   =      |
>                                 =           =-----------/\/\/\/\
>                             ----=  +    =
>                            |    =   =
>                            |    =
>                          __|__
> 
> 
> 
>                              ----/\/\/\/\----------------
>                              |                           |
> B)                           |                           |
>                              |  =                        |
>                              |  =   =                    |
>       -----------/\/\/\/\-------=  --   =                |
>                                 =           =---/\/\/\/\----------
>                             ----=  +    =
>                            |    =   =
>                            |    =
>                          __|__
> 
> 
> 
> 
> 
> 
> 
>                               ----/\/\/\/\----------------
>                              |                            |
>                              |                            |
>                              |                            |
>                              |      |  |                  |
>                              -------|  |------            |
>                              |      |  |      |           |
> C)                           |                |           |
>                              |  =             |           |
>                              |  =   =         |           |
>       -----------/\/\/\/\-------=  --   =     |           |
>                                 =           =---/\/\/\/\----------
>                             ----=  +    =
>                            |    =   =
>                            |    =
>                          __|__
> 
> 
> 
> 
>                               ----/\/\/\/\----------------
>                              |                            |
>                              |                            |
>                              |                            |
>                              |      |  |                  |
>                              -------|  |------------------|
>                              |      |  |                  |
> D)                           |                            |
>                              |  =                         |
>                              |  =   =                     |
>       -----------/\/\/\/\-------=  --   =                 |
>                                 =           =---/\/\/\/\----------
>                             ----=  +    =
>                            |    =   =
>                            |    =
>                          __|__
> 
> 
> 
> 
> 
> 
> 
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-- 
Harry Bissell & Nora Abdullah 4eva