[sdiy] multimode matrix filter question

[Harry Bissell]

I'd suspect that heat would not be more of an issue than it would be
with any other filter. If the expo conversion process (I think David is
using the inherent expo response of the 2164 here) is temperature stable, the whole thing should
track as a single unit. That leaves resistors (maybe 50ppm easy) and capacitors...
you'd want good quality tight tolerance caps anyway.

or would you like some Y5U ???   :^)

H^) harry



----- Original Message -----
From: cheater cheater <cheater00 at gmail.com>
To: Dave Manley <dlmanley at sonic.net>
Cc: synth-diy at dropmix.xs4all.nl
Sent: Wed, 20 Oct 2010 11:08:29 -0400 (EDT)
Subject: Re: [sdiy] multimode matrix filter question

I think it could turn out to be even more sensitive to heat.

But isn't that what we have epoxy resin for?? :-)

Cheers,
D.

On Wed, Oct 20, 2010 at 17:03, Dave Manley <dlmanley at sonic.net> wrote:
>  On 10/20/2010 7:31 AM, David G. Dixon wrote:
>>
>> These are just going to be simple outputs (like any other filter).  I was
>> just wondering about what gain levels to build into the actual matrix
>> circuit, since some of the derived filter modes are naturally much quieter
>> than others.
>>
> David,
>
> Have you spiced the various filter modes including the gain variability that
> will be present due to component tolerances?  I ran through a similar
> exercise years ago, and the frequency response is highly sensitive to
> component variation.
>
> -Dave
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-- 
Harry Bissell & Nora Abdullah 4eva