I have built the circuit found here.
I substituted with 22K resistors at R2 and R3, and substituted C1 and C2 with .022uF capacitors. These are all the components I have lying around. Everything else is the same. Even the transistor part number.
I realize that these substitutions will affect the frequency of the square wave. However, scrolling through every possible time interval I don't see a square wave. I see a sawtooth wave.
I don't quite understand how this circuit works, so it was my intention to build it, then dissect exactly how it works, but I can't seem to even get it working correctly.
I'm unable to dissect the circuit and see exactly how it works, therefore I can't determine why I'm getting a sawtooth wave instead of a square wave. I'm sure that it has something to do with the substitutions but the reason this effects the waveform is my interest.
My time interval is at 20uS. The period of the wave is very nearly 18uS. That makes the frequency of the wave 55.555kHz? That can't be right, can it?
It also seems that what I have done by accident could be used on purpose to integrate a square wave into a sawtooth wave?