Opamp Schmitt Triggers
Schmitt triggers are standard circuits in electronics, so you might think there’s nothing special about them. All you need is an opamp and a couple of resistors, right? That’s true if you don’t need precisely defined hysteresis and switching thresholds. But if you want to determine these values precisely and/or optimize them for standard resistance values, you need suitable circuits and the right formulas. Here we present both of these.