[sdiy] Low voltage synthesis?
modular at go2.pl
Thu Jan 13 18:13:58 CET 2022
1.5V rails might be slightly insane, but +/-3V why not.
Not to mention +/-5V, which is advertized in many opamp datasheets as
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:
and this runs down to 1.8V, although good performance starts at 2.1V:
W dniu 2022-01-13 o 17:20, cheater cheater via Synth-diy pisze:
> Synths generally run off 15V or 12V power rails, which among others
> helps with SNR. However, it creates a bunch of power dissipation, plus
> you can't use some of the tiniest components. Does it make sense to
> build synthesizer circuits that run on much lower voltages than that?
> Say, 1.5V rails? Are there techniques of suppressing noise that are
> better than just ramping up the voltage rails? Have the parts
> progressed enough nowadays that we can do this?
> Never mind stuff like interfacing with existing modular synthesizer
> parts etc. Let's say you're building a modern 8-voice polysynth with 4
> VCO, VCF, VCA, ENV, LFO per voice. Obviously that would generate loads
> of heat and possibly tuning issues given the constraints of a
> keyboard, plus it would be huge, especially given the size of
> capacitors vs their rated voltage.
> Where would noise creep in first if you started lowering rail voltage
> in your synthesizer designs? What other disadvantages in terms of
> signal integrity come from using low voltage rails for synths?
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