[sdiy] Another SSM2164 question

[Tom Wiltshire]

On 12 Aug 2008, at 19:11, harrybissell at wowway.com wrote:

> On Tue, 12 Aug 2008 18:21:19 +0100, Tom Wiltshire wrote
>> Thanks guys, that's helpful.
>
> <snip>
>
>> I shall also experiment with these values to see if it has any
>> effect/ influence on the resonance's frequency dependence.
>
> IMHO your "digging in the wrong place"  (was I the ONLY one it the  
> theatre
> who ROTFLMFAO when that was said in "Raiders of the Lost Ark")

Fair enough. I had no particular reason to think it would, but I  
thought I should check.

> Ian (Fritz) mentioned the "Q enhancement" that is documented
> in many places, including (and especially) Electronotes. The usual
> technique is small capacitors across certain feedback resistors to
> try and compensate the effect. This would be the best bang for the  
> buck.

Yes, I emailed Ian and he mentioned this. I'm yet to try it.
The quick and dirty way to compensate the resonance is simply to feed  
(some of) the Freq CV to the resonance VCA. As Neil said, the VCA can  
be considered to control  "damping", so as the frequency climbs, the  
damping increases.
I'd like to remove the effect at source if possible, but I'm pretty  
sure this would deal with it.

T.