[sdiy] pwming a tog

Dave Garfield daveogarf at yahoo.com
Wed Sep 20 01:49:10 CEST 2017

Hi, allWhile 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 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.
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FK50240 MK50240
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    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> 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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