[sdiy] Filter cut off DAC

[paula at synth.net]

Roman,

  Indeed the PPG Wave uses 8bit DACs and has filters it can switch in an 
out.
I was hoping to avoid the use of a filter (more parts = more cost), but 
it'll work out cheaper than a decent 16bit DAC.

Paula



On 2018-05-22 13:40, Roman Sowa wrote:
> Do it 12 bit. All you need is resolution enough not to notice
> quantization during parameter settings. Regardless if it's just cutoff
> on that DAC, or combined with LFO and envelope, it's still the same
> amount of filter frequency quantization, so if one cannot notice it on
> turning cutoff knob, it will not be noticeable with other modulation
> sources added either.
> And if you need smooth - just add simple analog filter after the DAC.
> Like 200Hz or so.
> 
> Roman
> 
> W dniu 2018-05-21 o 17:52, paula at synth.net pisze:
>> 
>>> So what do you want to do that might push the design goal above 13 
>>> bit?
>> 
>> Just thinking, if you add an EG to an LFO and a few other modulation 
>> routings I wonder if 12 bits is enough to keep things sounding 
>> "smooth".
>> 
>> Paula
>>