holtzman wrote:Well, I am both disappointed and happy with some first images produced by my drum-stepper combination. It works with 32 line NBTVA signal.
Sorry there is no sync yet, even any speed regulator, so it's impossible to take pictures. I'll try to describe the advantage of the slit drum method.
The lines spacing looks very accurate. There are no black or white stripes between some lines which are visible in my disc monitor. This is because there are no drilled apertures with existing spacing between lines which may be a bit different. Instead, each new line is spaced from the previous automatically, the spacing depends on the small drum speed. Once the speed is deadly locked to the main drum by means of stepper/optoforks driving unit, the lines are spaced precisely from each other. And this deadly lock seems to work in my monitor!
Now what doesn't work. The wobble does exist and it ruins the image vertically. Horizontal lines in the image appear in sine-wave shape. I planned that using slits in the main drum instead of holes will solve the wobble problem. But there still is some kind of irregularity causing wavy horisontal lines.
Stepper motor cogging is not the reason: I tried to rotate manually and thr wavy lines were still wavy. BTW, the stepper runs smooth and does its job well.
Hi thanks for the update !
I am interested so you are getting pictures with out sync only on the stepper motor controling speed ?
Hows the light levels..i found it low for 2 drums and what are you useing for the lights .
Also i am not sure if you are using a slit drum for the small drum .
Thanks for the schematic stuff it that is very useful !
Can you video it running ? seeing how it works not working 100% at this stage is useful to see.