Zero Cross Detector Electronic Circuits


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Zero Cross Detector Circuits
Last Updated on: Friday, August 29, 2008 02:34 PM

Circuits Designed by Dave Johnson, P.E.:

40KHz Ultrasound Receiver
A X100 transistor amplifier is followed by a zero cross detector circuit, using a voltage comparator. The output is a TTL logic signal, corresponding to the received 40KHz signal. (added 7/06)

LINE POWERED 60Hz CLOCK GENERATOR
This circuit is connected to the 120vac power line and transfers 60Hz clock pulses to a logic circuit. The optoisolator used provides 5000 volts of isolation between the power line and the logic side of the circuit.

WIDE BAND ZERO CROSS DETECTOR
This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave signal. It will work with inputs as small as 5mv peak to peak or as large as 3 volts peak to peak. The input frequency can range from a few kilohertz to about 150KHz.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

AN-42032 / FAN4822 Power Factor Correction With Zero Voltage Resonant Switching: Fairchild Application Notes / (Circuit / schematic design added 6/06)

Circuit yields Accurate Absolute Values: 07/05/01 EDN-Design Ideas / (added 6/03) The circuit in Figure 1 delivers the absolute value of the input signal with an accuracy better than 10 ppm of the full-scale range. The circuit has low zero-crossing error. You can use it as an asynchronous demodulator, as a source for logarithmic amplifiers, or simply as a demonstration of the wonders of....

FAN4822 Power Factor Correction With Zero Voltage Resonant Switching / AN-42032: Fairchild App Notes / (Circuit / schematic design added 6/06)

Sample / Hold Has Zero Droop & Infinite Hold: Maxim Application Notes / 12 / Jul-08 (Circuit / schematic design added 6/06)

Self Powered Sine to Square Wave Converter: Converts sine to square waves without a power-source Useful as a test instrument for audio purposes (Schematic added 9/04)

Time tag impulses with zero crossing circuit: 01/24/02 EDN - Design Ideas / (Electronic circuit added 10/03) A "constant-fraction discriminator" usually performs the time-tagging of impulsive events, which have a peaking time of the signal amplitude. The implementation of this technique requires a delay in the input signal of approximately the same amount as the signal's rise time. You can attain this delay by using a coaxial cable of an appropriate length. .

Zero Crossing Detector: Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc. (Circuit / schematic design added 6/06)

Zero-TC Reference Diodes: MicroNote 205 from Microsem (Application Note added 6/06)