Earth of the RC-LPF

[cyllboy]

I know... this is a newbie question...
Where do I connect the earth of the RC-LPF? As far as I know it is not the same as "ground".

I refer to the symbol:

   |
----- 
/////

Thank you!

[cyllboy]

Issue solved, I connected it to the common ground

[toyoshim]

Sorry, I haven't noticed your question.
Yes, using a common ground is fine. RC-LPF is a "kind of analog circuit", but here it is used only to generate a 2.5V signal from a 5V 1:1 PWM signal. So, we don't need to be so serious against noise.

[toyoshim]

this will be a good question to be kept open for others.

[cyllboy]

Thank you! Your design works like a charm!