Electronics devices

Zero Crossing Detector Op-Amp as Zero Crossing Detector The basic non-inverting comparator can be used as a zero crossing detector This circuit tells wether the input siganl is greater than or less than zero and indicates the zero crossing points of the input A typical circuit for such a detector It is a non-inverting comparator circuit with Vref=0V. During the positive half cycle, the input voltage is positive i.e above the reference voltage. Hence voltage is +Vsat During negative half cycle, the input Vin is negative, i.e below the references voltage. The output voltage is than -Vsat. Thus the output voltage switches between +Vsat and -Vsat whenever the input signal crosses the zero level. Thus the output indicates the zero crossing of the input by changing the state of the output waveforms we realize that zero crossing detector can be used as a sine to square wave converter