[sdiy] Driving SSI2144 freq control with PWM from a microcontroller

[Gordonjcp]

On Sat, Nov 05, 2022 at 08:03:43PM -0400, Ben Gebhardt via Synth-diy wrote:
> Interesting discussion!
> 
> I ran across this EDN article and want to try it out when I get a chance.  Seems like a good compromise between and RC and full blown active filter.  Has anyone done this before for synths?  I wonder if it’s practical for this application.
> 
> https://www.edn.com/cancel-pwm-dac-ripple-with-analog-subtraction/
> 

Pretty graphs, but does not actually work, at least in a simulator, and I don't see how it could work.

I'd be really keen to see how the author arrived at this scheme and how they tested it.

-- 
Gordonjcp