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      Zero crossing detector is used to convert sine wave or other signal into square-wave, the output should be low if the input is negative and high if the input if positive. Many zero crossing detector use split supply (symmetric supply), but this zero crossing detector circuit only need a single supply, thus suitable for battery-operated circuits.

Zero Crossing Detector using 741 IC

zero crossing detector waveform
 

Zero Cross Detector -  Presentation:

See also:

• www.circuitstoday.com/zero-crossing-detector
  
• sound.westhost.com/appnotes/an005.htm