[sdiy] Interesting article on top octave generators.

[Roman]

No, you don't. The resolution of frequency tuning you can achieve today with digital methods is far better than stability of tunable osc, or even ability to precisely tune it with a screwdriver. It doesn't have to be divider at all, but even then you can get into 0.5 cent area with 10 bit divider. 

The question is how precisely one should follow the tempered scale, and why keep the tempered scale if there are others scales where almost any interval sounds harmonic.

Roman 

---- Użytkownik Michael E Caloroso via Synth-diy napisał ----

>TOG or discrete dividers from a single master oscillator aren't going to
>produce a perfect equal tempered scale because the interval between equal
>tempered semitones isn't an integer ratio (the interval is an irrational
>number = 12th root of 2).
>
>If you want a true equal tempered scale, you have to use twelve tunable
>oscillators per semitone.
>
>MC
>
>On Fri, Dec 27, 2024 at 4:09 PM Tom Wiltshire <tom at electricdruid.net> wrote:
>
>>
>> On 27 Dec 2024, at 20:17, Ingo Debus via Synth-diy <
>> synth-diy at synth-diy.org> wrote:
>>
>> Am 27.12.2024 um 08:35 schrieb Donald Tillman <don at till.com>:
>>
>> If it was me, I would have directly emulated the chip with, say, 6
>> CD4040's and some diodes.
>>
>>
>> That’s what Elektor did in 1974:
>> https://www.elektormagazine.de/magazine/elektor-197411/55706
>>
>> They used TTL chips, not CMOS. It was quite a huge project. I remember
>> this so well because this was one of the first Elektor issues I bought
>> myself.
>>
>>
>> I honestly don't see the point of this type of approach. Discrete dividers
>> has all of the worst features of the TOG chips (locked frequencies, poor
>> frequency tuning, loads of circuit) without the few minor benefits (small
>> size, simplicity, and cheapness).
>>
>> IF you'Re willing to throw that much circuitry at the problem, why would
>> you *not* simply build a board with twelve top octave oscillators and then
>> just use dividers from there? I don't get it.
>>
>> I suppose the draw of only having a *single' trimmer to tune the entire
>> thing must have seemed absolutely magical in the late 1970's, and that was
>> enough!!
>>
>> Tom
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>
>
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