[sdiy] using a dac as a digitally controlled amplifier

[Tom Wiltshire]

The Synclavier used DACs for VCAs like this too, fed with audio from other DACs. In that case it was a way of avoiding doing multiplies in hardware and not losing any resolution.

> On 4 Aug 2024, at 18:20, Roman Sowa via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> One vintage example is FM in Oberheim Matrix synths.
> You get precision and repetitive stable amplitude needed for FM.
> 
> Roman
> 
> W dniu 2024-08-04 o 19:13, Benjamin Tremblay via Synth-diy pisze:
>> 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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