LM13900=LM13700?

[patchell]

    Now I can answer your question.

    Generally, the LM13700 will sub for a LM13600.  It depends on the
application.  The difference between the two is that the LM13600 has a bias
current applied to the darlington buffer that is derived from the Iabc
current.  The LM13700 has a fixed bias current in the buffer.  If the circuit
you are going to use it in does not use the buffer at all, then the two are
completely interchangeable.  If the circuit does use the buffer, well,
sometimes they work, sometimes they don't.  General rule of thumb, it probably
won't make a difference.  On the other hand, you might have to do some work.

    I know this is not much of an answer.  But finding LM13600 is going to be
difficult from here on out because they have been discontinued.  Mouser does
have a replacement part :513-njm13600d.  You can find them at
http://www.mouser.com.

Rob wrote:

> ----- Original Message -----
> From: patchell <patchell at teletrac.com>
> To: Rob <cyborg_0 at iquest.net>
> Cc: <synth-diy at mailhost.bpa.nl>
> Sent: Monday, December 27, 1999 6:47 PM
> Subject: Re: LM13900=LM13700?
>
> > I just did a search on the National Semiconductor Web site, and seem to
> have come up empty on the lm13900.  Is it posible
> > that it may be a misprint?  A hand written 7 could look like a 9?
>
> No, heh! I MEANT 13600, but in my left-handedness I turned the 6 upside
> down. Honestly, if you had caught me right after I had made the mistake, I
> would have SWORE it was 13900! Took me a little bit to convince myself ;)
>
> Sorry bout the mistake all!
>
> Rob

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