[sdiy] RE: [AH] Parametric EQ

[Tim Parkhurst]

On Sun, Feb 21, 2010 at 2:24 PM, Neil Johnson
<neil.johnson97 at ntlworld.com> wrote:
> Hi Tim,
>
>> What I'm wondering is, could a 'standard' expo converter be
>> used for the same purpose? Instead of using another 2164 section
>> (which, if you're already using all four sections of the chip,
>> requires you to use a second 2164), could you just use a couple of
>> transistors and an op-amp?
>
> In principle yes it would work - no reason for it not to.  BUT ... you lose
> the inherent thermal and behavioral connection between the gain cell and the
> expo converter if you use an external converter.  Of course, in some
> applications (e.g., filter resonance, filter frequency sometimes) this may
> not be so important.
>
> Neil
> --
> http://www.njohnson.co.uk

Right, I was thinking it should be just fine for an audio only VCA or
VC resonance. Okay, now somebody needs to breadboard this and see
what's what. ;)


Tim (my breadboard currently has too much butter on it) Servo
-- 
"Sire, the church of God is an anvil that has worn out many hammers."
- H.L. Hastings