Hey folks. I came across a portable 5" B&W TV which has some minor tuning problems, so I thought this could make a good platform to finally experiment with controlling a CRT on my own. It might be fun to try creating vector graphics and such from a microcontroller, or rigging up a simple oscilloscope since I don't own one yet.
My questions are mostly regarding voltages. What kinds of voltages should I generally expect to drive deflection coils/plates? And would those be in DC or AC? It seems like DC would do it considering it's basically an electromagnet driving them as far as I know, but I don't know enough about it to be making any premature assumptions. I would also assume that the voltage needed would depend on the tube size, so a larger TV would require more perhaps?
I would also need to be able to control the intensity of the electron beam. Or at least an on/off. So, again, I'm curious what type of voltage one should expect to apply, and AC or DC?
The TV in question just runs off of 12v. So I'm also wondering how much voltage it might potentially generate at the flyback for this small kind of tube? I'm afraid to put my dinky multimeter to the task in case it goes beyond the 750v setting (not that I'd feel comfortable even putting that much to it). This is more just out of curiosity, since I'm sure it's still plenty enough to give me a good shock. I'm still not sure what connection is what yet either until I do more investigating.
I'm assuming that neither the deflection nor the intensity requires very much voltage. But until I know more of what to expect, I'm afraid to go sticking a meter or anything on it just yet. Any info or pointers to a resource with information on such things would be much appreciated!