[sdiy] Formant 24dB filter

[Happy Harry]

The OP-07 indeed does not phase reverse... OTOH it is as slow
as the 741  ;^)

The OP-77 ('improved' OP-07) is NOT improved... it WILL phase reverse.

My education in phase reversal was VERY expensive....

($1000+ per reversal)

H^) harry


>From: Edu Silva <bahi0387 at terra.com.br>
>To: synth-diy at node12b53.a2000.nl
>Subject: Re: [sdiy] Formant 24dB filter
>Date: Wed, 06 Jun 2001 17:58:02 -0300
>
>Hi list,
>
>Brown David wrote:
> >
> > This sounds plausible, although I've not come across this phase
> > reversal effect before.  Can anyone suggest an opamp that DOESN'T
> > suffer from phase reversal?
>
>
>Try OP07. Maybe it's discontinued, but there's an IC called OPA07. if my
>memory still serves, it's the substitute.
>
>I can't find the datasheets in my HD...
>
>--
>
>     Edu Silva / ES2 Audio -   Salvador / BA / Brazil
>     bahi0387 at terra.com.br - http://audiolist.cjb.net
>
>
>
>
>.

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