saturn1bguy
New Member
Howdy,
Does anyone out there have a useful collection of logic gate RC oscillators? I'm aware of AN-88/118 from NSC/Fairchild, and have scrounged the web and found a few circuits, but am looking for more information.
In particular, although the following circuits all look quite similar, and yet different enough to make me ask, how would one calculate the output freq of say, the second and third? And given these all have an even number of gates, which the aforementioned app notes frown upon as they may not auto-start, it seems curious that there are so many oscillators out there like this.
The second circuit appears to use the two diodes and Rs for marking the high and low periods. Is this kind of stuff documented somewhere?
Does anyone out there have a useful collection of logic gate RC oscillators? I'm aware of AN-88/118 from NSC/Fairchild, and have scrounged the web and found a few circuits, but am looking for more information.
In particular, although the following circuits all look quite similar, and yet different enough to make me ask, how would one calculate the output freq of say, the second and third? And given these all have an even number of gates, which the aforementioned app notes frown upon as they may not auto-start, it seems curious that there are so many oscillators out there like this.
The second circuit appears to use the two diodes and Rs for marking the high and low periods. Is this kind of stuff documented somewhere?