Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => Preamps and Effects => Topic started by: shinychrome0 on May 06, 2010, 04:45:17 PM

Title: cascading low pass filter sections
Post by: shinychrome0 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?
Title: Re: cascading low pass filter sections
Post by: mnturner 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.
Title: Re: cascading low pass filter sections
Post by: phatt 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.