Color Mirror Screw Project


Posted on Feb 7, 2014

This would require a 1200 rpm synchronous motor and a light source, which would be made of a row of LEDs, arranged vertically, and located about 6 inches from the screw. My plan was enclose it in a clear plastic cabinet so all the components would be visible. Later, I had discussions with Darryl Hock about the possibility of making the mirror screw display color images.


Color Mirror Screw Project
Click here to download the full size of the above Circuit.

He said that he could make a custom Aurora converter, which would output red, blue and green 60 line video signals. At that point I decided that the display at the museum would be both mono (orange) and in color. The image would display all three colors simultaneously, not sequentially as in the Baird mechanical color system of the 20s. The light source would have a set of LEDs for each primary color: red, blue and green. Video from the Aurora converter would be amplified and used to drive each set of LEDs. With a mono display, a row of 3 mm diameter red LEDs can be stacked on top of each other, with a diffusing material in front to make the light more uniform. Since the screw we have is 4. 75 inches wide, the 3 mm width of the LEDs would result in a horizontal resolution of about 40 lines (4. 75 inches = 121 mm. 121/3 = 40). However, the LED row can be masked to make a slot about 1 1/2 mm wide, which would result in about 80 lines of resolution. If 3 mm LEDs were used, stacked vertically with alternating red, blue and green LEDs, it would be very difficult to use a diffusing material to even out the color (red LEDs would be 9mm apart, etc. ). The solution I have chosen is to use larger, 5 mm LEDs located on a separate chassis, with. 75 mm diameter fiber optic cables going from the top of each LED to the light source box, where the fiber optic cables will be stacked vertically, alternating red, blue and green. The height...




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