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Zero-Crossing Detector Using 741IC -Waveforms Zero-crossing Detector as Time Marker GeneratorДЇor an input sine wave, the output of the zero-crossing detector being a square wave, is further passed through an RC series circuit. These difficulties can be removed by using a regenerative feedback circuit with a positive feedback that causes the output voltage to change faster thereby eliminating the possibility of any false zero crossing due to noise voltages at the op-amp input.

Thus zero crossing are detected for noise voltages in addition to the input voltage. At the same time, the input noises in the op-amp may cause the output voltage to switch between the saturation levels. This causes further delay for the output voltage to switch between the upper and lower saturation levels. This causes a delay in time for the input voltage to cross the zero-level. This means that the waveform only changes slowly. In certain applications, the input voltage may be a low frequency waveform. They clamp the differential input voltages to either +0.7V or -0.7V. They are used to protect the op-amp from damage due to increase in input voltage. The diodes D1 and D2 are also called clamp diodes.

Similarly, when the input voltage passes through zero and goes in the negative direction, the output voltage is driven to positive saturation. Zero-Crossing Detector Using UA741 op-amp ICДЄs shown in the waveform, for a reference voltage 0V, when the input sine wave passes through zero and goes in positive direction, the output voltage Vout is driven into negative saturation. These are shown in the circuit diagram and input and output waveforms of an inverting comparator with a 0V reference voltage. The only change to be brought in is the reference voltage with which the input voltage is to be compared, must be made zero (Vref = 0V). Anyone of the inverting or non-inverting comparators can be used as a zero-crossing detector. It can also be called as the sine to square wave converter. The zero crossing detector circuit is an important application of the op-amp comparator circuit. Towards the end of article, we have drawn another circuit diagram of zero crossing detector designed using IC 311 and transistor.

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Towards the middle of this tutorial, you will learn about 2 applications of zero crossing detector вЂ“ which are time marker generator and phasemeter. We have a neat draw circuit diagram of zero crossing detector and we have explained its working principle and theory behind the scene in easy to understand words. In the initial paragraphs of the tutorial, you will learn zero crossing detector using op amp designed using the popular 741 IC. In this article, we discuss Zero Crossing Detector in detail with two different circuits.

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