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

[sasami at blaze.net.au]

>Johns circuit is more like a neural net. The comparator 
thresholds are
>modulated by the output state. As such, it is a more like a 
"ripple"
>converter. There are going to be brief false outputs before 
it settles on
>the correct answer.

I designed a circuit very much like this "ripple" one back 
in '80 or '81, and found it to be rather unstable. It 
worked, more or less, but was just too eratic to be of any 
real use. Admittedly I was using 741s.

Ken