[sdiy] multimode matrix filter question

[cheater cheater]

Thanks for the explanation, Harry! Very helpful as usual

Cheers,
D.

On 20/10/2010, Harry Bissell <harrybissell at wowway.com> wrote:
> 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
>