[sdiy] Is this a comparator?

[Jason Proctor]

<beginner>

if the two inputs are exactly the same, shouldn't the output sit at 
0v? not that anything is exactly the same.

could use a schmitt trigger instead of a bare comparator, too.

</beginner>



>Needham, Alan wrote:
>>Now this IS a comparator ...
>>strange choice of output though 1v ?
>>
>>An OpAmp with no feedback (open-loop gain of maybe 1000 ?),
>>one signal to each input, potential divider on output to give
>>0v or 1v.
>>If the two inputs are the same as each other the output could
>>go crazy for a while though !
>>
>
>Perhaps a very small amount (very large resistor) of positive 
>feedback would stop any crazyness in such a case?
>
>Seb
>
>
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