[sdiy] LT1228

[harrybissell]

LOL !!! yes, count on it

The LM13600 / 13700 is a GREAT 50 cent chip.  The offset voltage varies
with the Gm bias though... this means as a VCA if you move the control voltage
really fast you WILL hear a click. You cannot trim out the offset voltage
because it
changes. You can improve it, but not eliminate it...

The 3280 can be trimmed all the way out. No click

You might actually LIKE the click... or it might not be noticible. I'm using it
on
Guitar (and synth) and the LM13600 is OK for the VCF (which you might not use
really fast attacks anyway)... but I HAD to use a 3280 for the VCA.

H^) harry

Ray Wilson wrote:

> I think the LM13700 chip is excellent. In my opinion it is miles better than
> the CA3080 and definitely on par with the CA3280.
> They are relatively inexpensive and just a great chip. I know I'll hear
> about this one.
>
> Ray
>
> ----- Original Message -----
> From: "Gabriel Lindeborg" <gabriel at lindeborg.org>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Friday, May 20, 2005 10:03 AM
> Subject: Re: [sdiy] LT1228
>
> > Am I crazy or blind but it seems as if National still produces the
> > LM13700. Is the LM13700 chip that bad?
> > http://www.national.com/pf/LM/LM13700.html
> >
> > //Gabbe
> >
> > Oakley Sound wrote:
> >
> >> Anyone used one of these? Its an OTA with output amp and its seems to
> >> still be available from Linear Tech. Its a bit pricey though and the
> >> offset spec is nothing to shout about. Might be worth a look though.
> >>
> >> http://www.linear.com/index.jsp
> >>
> >> Tony www.oakleysound.com Oakley Modular Systems
> >> Penrith, Cumbria, England
> >>