Fig 2. Designers can use this version of the zero-crossing circuit for triacs that can be triggered by either a positive or negative voltage. This circuit is well-suited for transformer control.

The falling edge of the outputpulse happens at approximately 200μsec before the zero crossing. You canuse the circuit to safely stop the triggeringof a thyristor gate, giving it time toproperly turn ...

Zero-Crossing Circuit Avoids AC Noise Sept. 9, 2010 Explanation of how a diode divider can tame powerline noise on a zero-crossing detector's input circuit, improving ZCD sensitivity.

There are two 600V-protected detection blocks: zero crossing and reservoir capacitor voltage. Zero-crossing. Via separate diodes, the two zero-crossing detector pins connect direct to the live and ...

A bit of a re-think later, and a couple of wrong turns, I came up with circuit on the left of the top right diagram – essentially, there is a 330nf capacitor in series with the hysteresis feedback ...