[sdiy] “tilt” circuit

Tom Wiltshire tom at electricdruid.net
Thu May 21 10:39:12 CEST 2020


In a very similar vein, I did a VC-version of the BigMuff control using a single OTA. This appears in the Frequency Central Meth Amp module.

https://electricdruid.net/wp-content/uploads/2015/06/VCBigMuffTonecontrol.jpg

BTW, thanks for that EDN link, Phillip. I’d never seen the maths for these circuits before.

> On 21 May 2020, at 01:44, dougall <dougalli at gmail.com> wrote:
> 
> There is a voltage controlled implementation of a tilt eq in the delay section of the Shruthi Yellow Magic edition...
> 
> https://mutable-instruments.net/archive/schematics/Shruthi-Analog-LP2Delay-v02.pdf <https://mutable-instruments.net/archive/schematics/Shruthi-Analog-LP2Delay-v02.pdf>  
> 
> On Thu, 21 May 2020 at 06:08, Phillip Gallo <philgallo at gmail.com <mailto:philgallo at gmail.com>> wrote:
> 
> Maybe you've seen this EDN Design Idea:
> 
> https://www.edn.com/implement-an-audio-frequency-tilt-equalizer-filter/ <https://www.edn.com/implement-an-audio-frequency-tilt-equalizer-filter/>
> 
> p
> 
> 
> On Wed, May 20, 2020 at 7:06 AM Tom Bugs <admin at bugbrand.co.uk <mailto:admin at bugbrand.co.uk>> wrote:
> There's also a bit in Doug Self's Small Signal book - pages 269-271
> Very slightly different circuit-wise -  he also terms it 'tone-balance' 
> or tilt.
> 
> Best, Tom
> 
> On 20/05/2020 13:35, Paul Perry wrote:
> > Rod Elliott has this covered. Section 10 on this page:
> > https://sound-au.com/articles/eq.htm <https://sound-au.com/articles/eq.htm>
> >
> > paul perry Melbourne Australia
> >
> > ------ Original Message ------
> > From: "ulfur hansson" <ulfurh at gmail.com <mailto:ulfurh at gmail.com>>
> > To: "synth-diy mailing list" <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>>
> > Sent: 20/05/2020 10:22:46 PM
> > Subject: [sdiy] “tilt” circuit
> >
> >> hello list,
> >>
> >> i have been wanting to elaborate on a synth master output stage for a while, and these strange times have cleared up space for prototyping time...
> >>
> >> i have been thinking about a “tilt” circuit that could shift weight between volume on a hipass and lowpass circuit, effectively making it brighter or darker as you turn a single knob.
> >>
> >> of course an xfade with a hi/lopass derived from an svf could be the answer, but it seems rather huge for a simple idea - are there any simpler ways to achieve this that come to mind?
> >>
> >> hope you all are safe and well,
> >> -ulfur
> >>
> >> Sent from outer space
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