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This calculator will compute the resistor ratio R1/R2 and reference voltage for given high and low threshold values for a hystereses curve, or the threshold values given the reference voltage and resistor ratio.
The most commonly know comparator is the LM339 and it's various flavors. Rail to rail op-amps can also be used as comparators. The LMV324 is one such op-amp that is affordable, and works well as a comparator.
The design equations for this calculator can be seen at:
See our Votage Divider Calculator in order to compute R3 and R4 for a given Vr.
Comparator and Resistor Manufacturer Links
The best way to find comparators and resisters is to use our free Electronics Component Directory, where a myriad of electronics manufactures are listed.
Other Electronics Links
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