R7/R8 divider. I was too lazy to simulate a variable resistorWhere do you actually modulate the pulse width? I see no variable components.
Thanks for the suggestion, a little hysteresis would definitely makes it better.Maybe a little hysteresis would stabilize the comparator?
Just because it is on a breadboard (a solderless one, I suppose) does not make it unstable. I have built many function generator circuits with sine, square and triangle waveforms. Some work as high as 20 MHz and they are stable and predictable.PS: Since it was breadboarded, the freq was not too stable.
Maybe a little hysteresis would stabilize the comparator?