[sdiy] LM13600/13700 Practical Difference in Filters?

[Scott Bernardi]

The difference is in how the output stage was biased. If I remember 
correctly, I think the LM13600 took its bias current off the Ibias 
control current, so it variaed as the control current varied. This 
caused control feedthrough problems.  The LM13700 uses a fixed bias.
You should be able to substitute the LM13700 for the LM13600 no problem 
- you might even get a little better performance. If you are not using 
the output stage, they will be identical.

Ken MacBeth wrote:

> Hi List!
> I wonder if any one can help on this one. What is the difference in 
> using an LM13600 and a LM13700 in say the MS20 filter or in a State 
> Variable- can the they swapped around? I know that there is something 
> to do with the output buffers, but that's it!
> As always, any help appreciated. I wish I knew more than I do!
> Regards, Ken
>
>
>
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-- 
Scott Bernardi
sbernardi at comcast.net

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