[sdiy] Low voltage synthesis?

Jay Schwichtenberg jschwich53 at comcast.net
Thu Jan 13 20:31:07 CET 2022


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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