[sdiy] using a dac as a digitally controlled amplifier

[Tom Wiltshire]

Another example occurred to me, which is the Sequential Pro-FX programmable effects unit. It uses various techniques to control the circuits, but the 7524 8-bit MDAC is amongst them.

The MDAC is still available as the Analog Devices AD7524, Texas TLC7524, PMI PM7524, Micro Power Systems MP7524, and Maxim MX7524 if you want to try it!


> On 4 Aug 2024, at 18:13, 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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