[sdiy] 36dB VCF output drop while increasing emphases

[Harald]

Don't know what Roland did. I use a OTA in the feedback path and in the 
output path. So i can add the signal to output when increasing feedback.

Am 17.04.2015 um 14:53 schrieb Dan Snazelle:
> Nice writeup!
> Have you tried the Roland Q compensation method ?
>
> Sent from my iPhone
>
>> On Apr 17, 2015, at 8:10 AM, "Harald" <sdiy at haraldswerk.de> wrote:
>>
>> I am just working on a 36dB VCF. Plain forward design with LM13700. First steps here:  http://www.haraldswerk.de/wrdprs/ . As we know, output level decreases with feedback (Q). This can be compensated with increasing the output gain while increasing Q. But then the peak level of the output will be way higher as the normal output. Which might cause distortion in the next stage. Is there a compromise to avoid this or do i need to select: Lower output or increased distortion?
>>
>> Second thought: The filter works quite good. Does it make sense to go for 48dB musicaly?
>>
>> Harald
>>
>> www.haraldswerk.de
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>