[sdiy] Is this a comparator?

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I've been looking for almost the same thing:

Input voltage (0~10v)  compared to an adjustable reference voltage (10v
with an attenuator)

* If Input > reference, output would be 1v
* If Input <= reference, output would be 0v


Can anyone point me to a circuit that would do this?  I have something
I'd like try building with about 10 of these  :)

Drew




>> Derek Holzer wrote:
>>> There's a function I want to implement, but I don't know what to
call it 
>>> so I can't start researching the right circuit.
>>>
>>> I'd like to compare an incoming voltage with a reference voltage,
and 
>>> only allow the incoming voltage to pass if it's above the reference 
>>> voltage. I do not want to square the signal, I want to pass it
unaltered 
>>> so long as it's above the threshold of the reference voltage. When
the 
>>> incoming voltage is less than the reference, then the reference
voltage 
>>> would be passed (or none at all).
>>>
>>> What is this function called? A comparator? A gate? It's not a logic

>>> function, since it doesn't deal with square waves. I imagine it's a 
>>> simple op-amp trick...
>>>
>>> thx + best,
>>> d.