[sdiy] Interesting article on top octave generators.

[Jacob Watters]

I made a top octave synth as my first DIY project. It's all cmos based
(even the filter uses 4069 chips like the WASP). I went the route of 12
individual oscillators and 12 dividers, but I did that twice to get a
higher octave that isn't in perfect phase with the lower octave. I can
confirm that all those cmos chips on the same power rail caused a lot of
noise.

https://jacobwatters.com/electronics/c-monster-synthesizer/

*Jacob Watters*
JacobWatters.com <http://jacobwatters.com/>


On Tue, Dec 31, 2024 at 10:50 AM Richie Burnett <
rburnett at richieburnett.co.uk> wrote:

> > Also, a board with twelve oscillators...
>
> ...would be quite prone to suffering entrainment of at least some of the
> oscillators if they are high-frequency and free-running, unless they are
> properly isolated from each other and the supply is decoupled thoroughly.
>
> -Richie,
>
>
>
> -----Original Message-----
> From: Gordonjcp
> Sent: Tuesday, December 31, 2024 3:22 PM
> To: synth-diy at synth-diy.org
> Subject: Re: [sdiy] Interesting article on top octave generators.
>
> On Mon, Dec 30, 2024 at 04:23:24PM -0800, Donald Tillman wrote:
> >
> > Strategically it would make a lot of sense to build a 12 oscillator
> board
> > that cables into the IC sockets, sell off the working TOG chip, and then
> > either sell boards to other Hammond X5 hackers, or just publish the
> > schematic, parts list, and Gerber files.
>
> Why would you make such a comically overcomplicated device with so many
> fiddly adjustments, when you can just spend a couple of quid on an
> inexpensive multi-channel programmable divider?
>
> It makes no sense, and having twelve oscillators that all drift randomly
> in
> and out of tune would drastically affect the character of the instrument.
> Also, a board with twelve oscillators is far more of a redesign than a
> simple single-chip divider replacement.
>
> --
> Gordonjcp
>
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