[sdiy] Low voltage synthesis?

Roman Sowa modular at go2.pl
Fri Jan 14 08:04:18 CET 2022


It is all eventually scaled down to 18mV/oct anyway

Roman

W dniu 2022-01-13 o 21:53, Pete Hartman via Synth-diy pisze:
> Doesn't that get you down where you need to be a lot more cautious 
> about noise, particularly coupled signals?
>
> On Thu, Jan 13, 2022 at 2:51 PM Tim Parkhurst via Synth-diy 
> <synth-diy at synth-diy.org> wrote:
>
>     I always thought the 1.2V/O Buchla standard made a lot of sense.
>     Maybe something like that (0.1V/step), scaled down would be nice.
>     On a +/-3V system, take a 0 to 2.4V signal to cover 10 octaves,
>     giving you 0.02V/step or 0.24V/Octave.
>
>     One by-product of LVSDIY might be modular levels that are easier
>     to use with existing guitar effects boxes. We're definitely closer
>     to line-level or even instrument-level signals here, right?
>
>     Cheers,
>
>     Tim (I'll admit the LVSDIY acronym needs some work) Servo
>     ---
>     "Imagination is more important than knowledge." - Albert Einstein
>
>
>
>
>
>     On Thu, Jan 13, 2022 at 11:34 AM Jay Schwichtenberg via Synth-diy
>     <synth-diy at synth-diy.org> wrote:
>
>         Audio is one thing but what about frequency control voltages?
>
>         If you want a full range VCO or filter using +/-1.5 or +/-3
>         volts you
>         won't have much range with 1V/O.  So you'll have to live with
>         the range
>         or change to something non-standard like maybe 0.25 or 0.5 V/O.
>
>         Jay S.
>
>         On 1/13/2022 9:13 AM, Roman Sowa wrote:
>         > 1.5V rails might be slightly insane, but +/-3V why not.
>         > Not to mention +/-5V, which is advertized in many opamp
>         datasheets as
>         > "high voltage".
>         > Synths rarely run signal hitting anywhere close to +/-15V
>         rails, more
>         > like 5 to max 10Vpp. Scaling it down to 6Vpp in +/-3V system
>         looks
>         > then like no change at all.
>         >
>         > 5V synth is actually one of my current obsessions so
>         (forgive my
>         > blantant bragging) here are 2 examples:
>         > this is powered from +/-3, but will happily run at +/-1.5V too:
>         >
>         https://midi-hardware.com/index.php?section=prod_info&product=Pierdzidelko
>         <https://midi-hardware.com/index.php?section=prod_info&product=Pierdzidelko>
>
>         >
>         >
>         > and this runs down to 1.8V, although good performance starts
>         at 2.1V:
>         > http://sowa.synth.net/schem/vco8/
>         >
>         > Roman
>         >
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