[sdiy] CV buffer

[Takuya Katayama]

Hi Tom and friends!

Long time ago (1976-77) I made active CV "multi-tap".
I and my companies were also afraid of the problems that
Tom wrote.
To avoide the problems, we used LM312 (internally
compensated LM308) for buffer OP amps, and got good
perfomance.
Other day we test 741 in place of 312 and a little
difference, but good enough.
Difference was only DC offset voltage.
312-->0.3mV
741-->2mV
So I recommend some lowcost precision OPAs, such as OP07 
or its families.
Use protective resistors between output pin to neative
input(1-2kohm), 470ohm in series to output terminal.
 
I think 324/2904, 074 are NOT recomended.

===
Takuya KATAYAMA
Muse Music Synthesizer Lab., Tokyo.

--- Tom Arnold <xyzzy at sysabend.org> wrote:

> I need to build a buffer so I can spread a single CV
> out to multiple
> destinations without cross pollination on the output
> side.  I'd just do a
> quick opamp buffer but I remember reading horror
> stories on this list of
> tiny errors being added.
> 
> Any suggestions on a stable way to do this without
> adding noticable error?
> 
> -- 
> 
>
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