Green Ringer "Nulling" Mod

[Mark Hammer]

Just to be clear, I suggested soft clipping after the frequency doubling.  Like so:

[Steben]

https://rainsanaloglab.wordpress.com/2018/05/03/octave-drive-rains-analog-final-project/

Great site.
Here we have opamp full wave rectifier and soft clipping "after" together.
Even with a perfect sine, we see that the component tolerances add enough imperfection on there own.
With the soft clipping after, the imperfection stays.

Quite odd here. I was really smitten on the idea which I though was yours  of adding soft clipping in front of the detection.
On top of that I really love the effect of a Fuzz Face before a Ringer which is even more drive before.

Here you go, my DRIVE UP concept:
https://www.diystompboxes.com/smfforum/index.php?topic=125624.new#new

[Mark Hammer]

Thanks for that link, Steven.  Rain's classmates - and there are many - also have interesting class projects.

Although the feedback cap in the Drive Up tames the top end feeding the phase splitter, let's bear in mind that it provides a humble single-pole lowpass filtering function, so harmonic content in the boosted input signal still feeds the phase-splitter and gets doubled.  So, a second pole of LPF just ahead of the volume control will be helpful to keep the frizz in check.

Now, if soft-clipping in the op-amp driver stage functionally equivalent to the Q&D diode limiter shown in the Foxx and similar units?  Good question.  I don't know.  I'd be interested in anyone's experience in this regard, or their theoretical musings.