[sdiy] using a dac as a digitally controlled amplifier

[Neil Johnson]

Hi Benjamin,

The Audio Precision System One does exactly this in its SVF-based sine
wave generator.  There are two MDAC hybrids that set the frequency of
the oscillator.  It allows easy control of the frequency from the
controller PC.

Cheers,
Neil

On Sun, 4 Aug 2024 at 18:17, Benjamin Tremblay via Synth-diy
<synth-diy at synth-diy.org> wrote:
>
> Is there any practical application for synthesizers to pass an analog signal in as a reference voltage to a DAC?
> 12 bit DACs are pretty cheap these days, but VCAs aren’t expensive either.
> Aside from cost, why would I want to use a DAC as a “DCA”?
>
> I can imagine making a state variable filter using a dual DAC as the ‘gain' stages.
> It’s the kind of thing I would try just to see how well it worked…
>
> I suppose you inject one or more DACs into an oscillator to directly control pitch and waveform, some kind of DCO where stability and simplicity are cost-effective.
>
>
>
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