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

[Michael Bachman]

I am thinking of building the 4p Misson board. (or some variant)

What I wonder is, with all those mixing resistors in the circuit
bleeding between pole outputs, what affect it may have.

True , if it provides a wide range of nice sounding filter functions,
then it has value to build, but does its 4 pole LP setting really have
the same qualities as a normal 4pole OTA filter?

Mike

On Wed, Nov 27, 2013 at 2:06 PM, Dave Manley <dlmanley at sonic.net> wrote:
>
>
> 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.
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy