Tandy Radio Shack Color Computer Video Adapters
The first one is called "other bob" and appears to be home made. It provides options for monochrome or color video as well as sound.
The second one may be patterned after the Mark Data version although I am not positive.
It is unusual as it is housed in a small brass box and was soldered onto the top of the Astec modulator in the Korean 26-3134A Color Coco.
They had cut the slot in the back case higher so the phono jack was right above the RF jack of the modulator. It only offers composite out and no sound. To the right you can see the little brass box.
Files to build the second version
The image to the left is a cad drawing of the schematic of the one in the brass box and the image on the right is a cad drawing of the printed circuit board.
A copy of the Gerber file for pcb manufacture can be found HERE. The size of the board is 2 inches long by 1.3 inches wide.
Any of the inexpensive PCB houses like JLC or PCB Way can make the board using that file.
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