Moderators: Dave Moll, Andrew Davie, Steve Anderson
holtzman wrote:I am thinking about making a smaller monitor, something portable and easy to use...
This way I came to idea of a 1500 rpm, double-spiral 32 line drum tv. The light commutation can be made by means of a striped cylinder driven by stepper motor.
Drum diameter is planned to be 21 cm (approx. 9"). So the whole unit is going to be like a bit oversized toaster. The image size should be about 41X26mm, and I am not sure if any magnification will be applied.
One of the problems is that I have no free time to actually build it
DrZarkov wrote:I like that concept, exsp. the oldfashioned way of synchronisation. But I would simplify the scanner: It would be enough to get a spinning mirror with only 4 or six sides (which is much easer to make/get), or a Mihaly/Traub scanner, which is easier to make and adjust than a polygon mirror.
holtzman wrote:Yes Harry you got it exactly right. I plan to place an optical interrupter somewhere in the centre of the bolts disc.
This is what i have already tried - to drive a stepper by pulses from the LDR optofork. I connected only 1 set of stepper coils to optofork circuit and after kick-start it rotated synchronously. There was a flywheel on its shaft. Now maybe if I add connection to the second coils' set via capacitors, the motor will rotate even better, without kick-starting?
The program I use for planning is a 3d engineering program.
holtzman wrote:maybe if I add connection to the second coils' set via capacitors, the motor will rotate even better, without kick-starting?
Users browsing this forum: No registered users and 9 guests