[sdiy] Shruthi 4PM (was re something else...)

[Dave Manley]

Tom Wiltshire <tom at electricdruid.net> wrote:

>2) THAT2162 is non-inverting. There are a number of occasions where the
>inverting nature of the 2164 is very helpful. Olivier Gillet's "Four
>Pole Mission" Xpander-style filter is a good example:
>
>http://mutable-instruments.net/shruthi1/build/4pm
>

This is a very nice implementation. 

One thing I've droned on in the past about is the sensitivity of the different modes to the summing resistor tolerances.  With exact values the calculated responses are obtained.  With real world tolerances perhaps not so much.  Has anyone measured the actual filter responses to see what they look like?

It would be interesting to see the results from multiple boards.

Dave

P.S. yes, before anyone states the obvious, all that really matters is what it sounds like.