I have a 24 k.bps speed and it's a pain.
You should have mentioned that earlier. I agree with westfw about the videos.
What is it and why is it so famous.
It provides an easy and inexpensive way to generate fairly stable 'square' waves or trigger pulses.
It is a linear device that does not require a regulated supply voltage.
One thing that makes it easy to use is that the triggering is based on ratios. That is, something happens when one voltage is a certain percentage of another (I don't remember all the details). This means that if the supply voltage changes you can expect the frequency of your square wave to remain essentially the same.
Don