[sdiy] pwming a tog // DSPsynth // Jan Ostman

[Tom Bugs]

dspsynth // Jan Ostman needs a warning given the large number of people 
who have not received what they've paid for over the last few years - 
spread across various forums, kickstarters etc.
But there are some projects that are now open-sourced, so maybe 
interesting to look.


On 20/09/2017 03:21, Mike HEQX wrote:
>
> 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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