[sdiy] LM13600/13700 Practical Difference in Filters?

[Ken MacBeth]

Hi, Scott, Yves- thanks for the replies! I have always wanted to try out a VCF built around these chips- I've designed the circuit and can fire on!
Regards, Ken

Scott Bernardi <sbernardi at comcast.net> wrote:
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 Bernardisbernardi at comcast.net



http://www.macbethstudiosystems.com
Home of the M3X Analogue synthesizer...

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