Temperature-compensated resonance ( was Re: [sdiy] RE: [AH]

[cheater cheater]

Sorry, I guess I was supposed to say something more to the effect of
'have no temperature drift' or 'do not change much with temperature'
as opposed to 'have temperature compensation' - since some designs do
not need to be compensated. Since when do inductors require
temperature compensation? I guess to some level, but less than silicon
based designs I guess (has anyone got info on how those compare -
inductors vs transistors?) I guess you have proven my point there,
although I have not expressed myself adequately.

Professional recording engineers need repeatability. They need to be
able to recall a mixing session years later, because a new mixdown can
be worth 6-7-8 figures. A difference of 0.5 dB can make or break a
mix, especially a complex one. It is very difficult to fix this if you
have 120 stems. Do you think temperature drift is acceptable in that
situation?

Maybe it's not worth to you - but it just depends on whether it
calculates for your business to have that extra or not. I don't know
how much money you put on the stake when archiving into your library
for later recall; once it starts being enough, you'll start
considering different levels of security and certainty. There's a
reason why many recording engineers have a space in their session info
chart for the ambient temperature of the day, and take photo evidence
of the order of equipment in the rack.

To turn your question on you, how many of your equalizers state the
temperature dependency of different parameters?

Cheers
D.

On Mon, Feb 22, 2010 at 18:50, Cary Roberts <cary.roberts at retrosynth.net> wrote:
>>This only shows the sad state synth designs are in. Most high quality
>>equalizers have tempco Q.
>
> Can you name some EQs that have tempcos?  I'd like to think I have a number
> of high quality EQs and not a single one has tempcos in it.  This list
> includes Neve, Focusrite, API, Melcor, Electrodyne, Quad Eight, Sphere, ADR,
> and Troisi.  In the recording world inductor based EQs are considered
> "better".  The best sounding EQs I have are Sphere 910s which are inductor
> based.  Very clever circuit design.  I should also say my next favorite EQs
> are gyrator based (Focusrite ISA110s and Peter Trois 518s).  The Peter
> Troisi units use no transformers nor esoteric parts so they were a pleasant
> surprise.
>
>>The way I think of this is that I can't figure out all ways that
>>people will be using my synth/eq/computer program/other invention,
>>therefore I shouldn't compromise where *I* think that *I* don't need
>>the accuracy. I usually go and ask experts, I'm definitely not the
>>best expert in the use of anything I created.
>
> The capcitors in most EQ circuits are +-10% at best.  You'll occasionally
> find polystyrene in a few designs but that seems to be the exception.  I
> doubt the inductors are better than +-10% either.
>
> -Cary
>
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