Figure 1 This zero-crossing detector uses low-voltage parts and consumes little power. Figure 2 In this LTspice simulation, as the input voltage drops through 0V, the LED current makes a pulse whose ...

This design idea explains how a zero-crossing detector circuit can be used to control triacs. Fig 1. This zero-crossing detector circuit generates the control pulses needed to turn on triacs that ...

I blew up the opto-coupler in my little isolated zero-crossing detector on Sunday. It was already working well when I thought – hmmm, I wonder if this different output circuit would also work…. And it ...