I can has... 15 filter modes?

Discontinued products Shruthi
#1

Hello!
This is my first post :slight_smile:

I’m wondering, is it easy / possible to get all the 4-PM board tricks with LM13700 chips only? I mean, I’d like to build a filter based on SMR-4 schematic but I’d like to have those 15 filter & 4 resonance modes.

What do I need to pay special attention to when trying to “mixing” SMR-4 & 4-PM schematics? I don’t want to blow up the LM13700 :slight_smile:

#2

You can get more filter modes out of the SMR 4 design… But I don’t know about 15…
You might find this thread interesting :slight_smile:

#3

Thanks!
I overlooked that thread.

#4

Yes, you can do the same thing from the 4 integrators (the op-amps with a 1nF in the feedback loop) of the SMR4.

#5

Great! Thank you for the response.