[sdiy] pwming a tog

[Mike HEQX]

Yes I did look at the flat keys piece recently as well as the dsp synth 
psuedo-tog which is $25.

http://www.dspsynth.eu/

This really interesting page

http://www.armory.com/~rstevew/Public/SoundSynth/TopOctave/topdividers.html

This article

http://www.logosfoundation.org/kursus/2073.html

and this

http://www.narcisivalter.it/progetti/top-octave-synthesizer-5010.html




On 9/19/2017 7:49 PM, Dave Garfield wrote:
> Hi, all
> While it doesn't do PWM, an English company named FlatKeys produces a 
> Top Octave Generator replacement for the classic synths and organs 
> which use a 50240 TOG.  This one isn't just a divider; it generates 12 
> separate top octave waves which are in tune, unlike the originals' 
> approximations.
> It will also do vibrato, as it has a master clock. It can switch 
> octaves if desired, or transpose keys.
> The price is £52.80.
> I haven't tried one out, but have been meaning to for a long time.  If 
> anyone else out there has, I'd love to hear about it - warts and all.  
> Maybe it will work for you, or someone else out there.
> FK50240 MK50240 <http://www.flatkeys.co.uk/MK50240.html>
> I am NOT affiliated with FlatKeys in any way, shape, form or manner.  
> Just thought that this might be a good solution for replacing scarce 
> top octave divider chips.
>
>
> 	
>
>
>     FK50240 MK50240
>
> 	
>
> <http://www.flatkeys.co.uk/MK50240.html>
>
>
>
> On Tuesday, September 19, 2017 5:32 PM, Tom Wiltshire 
> <tom at electricdruid.net> wrote:
>
>
> Because the standard TOG is based on dividers, you can’t add PWM. Run 
> any width pulse wave through a flip-flop and the output's a square, 
> after all.
>
> That said, there were some TOGs the produced 33% pulse waves rather 
> than squares (not sure exactly what the internals were to do that) but 
> there were none that offered PWM.
>
> If you had twelve ramp oscillators for the top-octave, you could 
> arrange ramp+squares to give you ramps at various divided octaves, and 
> then use those ramps to produce PWM, but it’d be a lot of circuitry, 
> and it’d probably get a bit sensitive. Have a search for “sub-octave 
> ramp wave” to get the basic idea.
>
> HTH,
> Tom
>
> ==================
>       Electric Druid
> Synth & Stompbox DIY
> ==================
>
> > On 20 Sep 2017, at 00:06, Mike HEQX <mike at heqx.com 
> <mailto:mike at heqx.com>> wrote:
> >
> > I wanted to do something with a TOG and I was hoping I could add PWM 
> to it. Not sure if you can PWM the master clock though, but that's 
> what I want to try. After all you pitch bend it that way.
> >
> > I not does that mean 12 pwm on the output of the tog?
> >
> >
> > thoughts?
> >
> >
> > Mike
> >
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