[sdiy] 3/4 bit A/D converter (was: Sample&Hold thoughts)

[KA4HJH]

>If you use LM319 comparators and put RGB video through it, it produces an
>effect called "posturization" or fixing of the color levels. This was used
>in the Sandin Image Processor. The output summing resistors can be replaced
>with pots for variable levels.

I wonder how this approach compares with John Simonton's 4 bit flash
converter? (only 4 opamps). Is this faster? How much?

-- 
Terry Bowman, KA4HJH
"The Mac Doctor"