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[SOLVED] Designing a comparatar switch

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tajiknomi

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I have two supplies, V1 and V2. V1 is fix to a certain voltage. V2 is variable and I want to switch the external circuit ON when V2 < V1. For this case I have used OP-AMP as a comparator. But what I want to do next is to put two thresholds (UT and LT; Both positive).

The Output of OP-Amp(or another circuit) should be either +Vsat OR Ground (NOT Negative!).

The signal isn't sinosidal (as shown in figure), It's just to give you an idea how the output should respond to the input signal.
Capture.PNG
 
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Hi,

You didn´t specify input_voltage range.

I´d use a comparator instead of an OPAMP (Because it is desigend to be a comparator).
And add some hysteresis.

What comparator to use depends on your signal voltages, supply voltages, hystereis circuit and output behaviour.

Klaus
 

Input voltage range is 12v. UT=4v; LT=3v2
 

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