Editing Operational amplifier (section)

===Positive-feedback applications===

[[Image:Op-Amp Schmitt Trigger.svg|right|thumb|300px|Schmitt trigger implemented by a non-inverting comparator]]

Another typical configuration of op amps is with positive feedback, which takes a fraction of the output signal back to the non-inverting input. An important application of positive feedback is the comparator with hysteresis, the [[Schmitt trigger]]. 

Some circuits may use ''positive'' feedback and ''negative'' feedback around the same amplifier, for example [[triangle wave|triangle-wave]] [[oscillator]]s and [[active filters]].