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Author Topic: cascading low pass filter sections  (Read 4286 times)

shinychrome0

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cascading low pass filter sections
« on: May 06, 2010, 04:45:17 PM »
I'm attempting to make a high-order low-pass filter that i run after all my effects in my signal chain.  I'm trying to figure out how to cascade several single pole filters. I know you can't just slap one after the other, but what if i stick a simple op amp buffer between each stage?  would that cascade correctly and give the desired effect?

mnturner

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Re: cascading low pass filter sections
« Reply #1 on: May 07, 2010, 05:13:36 AM »
Yeah thats basically what you do, or you could use something like a sallen-key active filter.
This TI doc has plenty of info on active filters: http://focus.ti.com/lit/ml/sloa088/sloa088.pdf
Google active filters and you should find plenty of info.

phatt

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Re: cascading low pass filter sections
« Reply #2 on: May 07, 2010, 07:11:36 AM »
Hi ,
Just google *Ed Rembold Marshall Sim* as simple as it gets and it works.
I've made several of these and sold everyone. 8)

Or just find a schem of any JTM 30 or 60 Marshall Amp
The circuit is simple to see,, just delete the balanced out part.
Phil.