[sdiy] pwming a tog
mike at heqx.com
Wed Sep 20 04:21:08 CEST 2017
Yes I did look at the flat keys piece recently as well as the dsp synth
psuedo-tog which is $25.
This really interesting page
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'
> 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
> 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.
> 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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