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Questions tagged [zero-crossing]

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Zero-crossing refers to detecting the point at which a sine wave reaches the zero point of magnitude. In AC circuits it corresponds to the point at which no voltage is present so switching at that point reduces interference.

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I’m building a zero-cross detector using an LM393 OpAmp (as that is readily available with me). My AC source is a wall adapter (plug-in transformer: 120 VAC → 9 VAC). The output block has three ...
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I want to turn on/off LED bulbs and AC fan from a microcontroller. No chopping control is required. I only needed isolation and low noise soft switch that's why I've chosen a zero-crossing opto-TRIAC ...
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So, when i was checking the BM1Z102Fj datasheet it mentioned its ACOUT Pin voltage range from 0-0.3V to +29. Now I am using a STM32G070RB which has highest +5V tolerant pin only not more than that. ...
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I want to design an electrical circuit to regulate power of IR heater. I want to be robust, immune to electrical noise, and ensures long-term stability and reliability under real-world operating ...
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I would like to detect zero crossing of mains for the synchronization of 2 devices. These devices run on DC via a "wall wart" power supply. Detecting zero crossing with a direct connection ...
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I am using an Arduino to control an incandescent light bulb using TRIAC. I have the following setup: AC Input - 20VAC @60Hz using a stepped down transformer. DC - Diode Rectifier. The output of the ...
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I am trying to detect zero crossings of a 50Hz sinusodial signal, with the ADC. My code is like this, with a small offset I am trying to detect zero crossings and than give a small pulse just to see ...
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I have the following circuit taken from Arts of Electronics. I am using it to detect zero-crossing of a 40V-RMS/50Hz input. I am connecting the output of the comparator LM 393 to a GPIO pin of Raspi ...
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I'm designing a flexible AC transmission system that utilises TSR.I'll need to use a voltage zero crossing and current zero crossing in my circuit to send to the microcontroller. I've being playing ...
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I have this zero crossing detection circuit, and it does detect the zero crossing. The problem is that the output signal is a bit sinusoidal than expected, and voltages around 2 V where it's neither ...
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I need to control the shutdown of a load that operates with a voltage of 25V and a maximum RMS current of about 90 mA. This load is working almost always and rarely needs to be turned off. For which, ...
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Beginner here. I am trying to make a "zero crossing" circuit with phase control. This is probably not the right name for the circuit. Basically, I have a sine wave (from the power outlet) at ...
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I have this idea to dim a light. The problem is that my EBS simulation software won't allow me to see the actual result of the dimming. The only way to test it out is to physically construct the ...
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General Information About the Project I am trying to design a zero-crossing detector circuit for convert the sinusoidal signal from an ultrasonic transducer to a square wave. Here is the image of ...
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I have a triac in a 60Hz 120V power line (as is often done for dimming) and want it to only switch on the power when the AC voltage is low (widely between -40V and +40V would even be fine). This is ...
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