op-amp low frequency pulse generator

[audioguru2]

I forgot to mention that it wouldn't need a diode for it to have a long capacitor charge time and a short discharge time.

Please explain this more.

Here's a sketch:View attachment 38289

 

[audioguru2]

Remember also, that AC can be considered infinitely small DC steps!!!

I agree with your explanation and your math.
Why does this site mess-up certain English symbols? I see a lot of open squares in your text, and in the text of my projects.

My extremely low distortion sine-wave generator uses a CD4018 Johnson Counter as a DAC to make a stepped sine-wave with very low 2nd to 8th harmonics. You could say it is an over-sampled sine-wave.
It is filtered by an 8th-order switched-capacitor Butterworth lowpass filter IC that also has a stepped output but at a very high frequency. It is followed by a 2nd-order (or 3rd?) analog Butterworth lowpass filter circuit. It has steps all over the place but its output is perfect! ;D