LM13600

[Harry Bissell]

NJM (new japan ???) makes an LM13600... the LM13700 doesn't have access to
the bias points so you can't do it...
The LM13600 has lower buffer (darlington) bias current at low Gm, and
higher current at higher Gm... at the possible expense of feeding some
"thump" into the darlington as the Gm bias is varied (like VCA or VCF with
fast attack...)
The LM13700 has fixed bias for the buffer, alas... at too high of a value
to be really effective witlow Gm inputs...

Even National didn't seem to know which one is right for you...

Tom G has a VCO which doesn't work with the LM13700... but says the LM13700
is OK for the MS-20 VCF design...

:^) Harry

Paul Maddox wrote:

> All,
>
>   If the 13600 and 13700 are similar, would it not be
> possible to add a couple of simple components to bias the
> diodes on the 13700 so, it could be used were a 13600 is?
>
>   Paul
>
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>
> -----Original Message-----
> From:   Jim Battin [SMTP:PlanetZ at mediaone.net]
> Sent:   Tuesday, October 26, 1999 2:29 PM
> To:     synth-diy at mailhost.bpa.nl
> Subject:        LM13600
>
> I'm trying to build a Korg MS-20 Dual Filter (From the cookbook :).  I
> allready have most of the parts, however I am having troubling finding
> an LM13600.
>
> The LM13600 seems to be hard to come by (or atleast in the US).
> Digikey, Jameco, and mouser don't carry it (pios.com does however.. but
> You have to call about getting it in stock).  Is there a op-amp with
> similar specs that can be used in its place? (LM13700?).