[sdiy] Low voltage synthesis?

Pete Hartman pete.hartman at gmail.com
Thu Jan 13 21:53:51 CET 2022


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
>> >
>> >
>> > 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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