Leslie Newell wrote:
>
> Another odd thing - in differential mode if I disconnect one line the 
> input toggles randomly, obviously picking up noise. Again, shouldn't a 
> balanced input give no output with one line disconnected?
>
>   
No.  Unless either a bias is added to the inputs, or the comparator has 
significant hysteresis, when the comparator has the same voltage on both 
inputs, it can't make a decision.
So, you get noise - ie, it is bouncing between yes and no.

Jon

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